Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Sep. 30, 2017	Nov. 30, 2017	Mar. 31, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	EMCORE CORPORATION
Entity Central Index Key	0000808326
Document Type	10-K
Document Period End Date	Sep. 30, 2017
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2017
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Amendment Flag	false
Entity Common Stock, Shares Outstanding		27,128,382
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 239.0

Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 122,895	$ 91,998	$ 81,685
Cost of revenue	80,361	61,044	52,994
Gross profit	42,534	30,954	28,691
Operating expense (income):
Selling, general, and administrative	22,246	20,734	24,711
Research and development	12,542	9,921	9,119
Impairments	506	0	0
Recovery of previously incurred litigation related fees and expenses from arbitration award	0	(2,599)	0
Gain from change in estimate on ARO obligation	(45)	0	(845)
(Gain) loss on sale of assets	(456)	(41)	228
Total operating expense	34,793	28,015	33,213
Operating income (loss)	7,741	2,939	(4,522)
Other income (expense):
Interest income, net	245	88	75
Foreign exchange gain (loss)	82	(394)	(138)
Change in fair value of financial instruments	0	0	122
Other income	316	0	0
Total other income (expense)	643	(306)	59
Income (loss) from continuing operations before income tax expense	8,384	2,633	(4,463)
Income tax (expense) benefit	(163)	(14)	2,191
Income (loss) from continuing operations	8,221	2,619	(2,272)
Income from discontinued operations, net of tax	14	5,647	65,372
Net income	8,235	8,266	63,100
Foreign exchange translation adjustment	(18)	(268)	(990)
Comprehensive income	$ 8,217	$ 7,998	$ 62,110
Net income (loss) per basic share:
Continuing operations (in usd per share)	$ 0.31	$ 0.10	$ (0.08)
Discontinued operations (in usd per share)	0.00	0.22	2.18
Net income per basic share (in usd per share)	0.31	0.32	2.10
Net income (loss) per diluted share:
Continuing operations (in usd per share)	0.30	0.10	(0.08)
Discontinued operations (in usd per share)	0.00	0.21	2.18
Net income per diluted share (in usd per share)	$ 0.30	$ 0.31	$ 2.10
Weighted-average number of basic shares outstanding (in shares)	26,659	25,979	30,012
Weighted-average number of basic shares outstanding (in shares)	27,544	26,518	30,012

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 68,333	$ 63,905
Restricted cash	421	965
Accounts receivable, net of allowance of $22 and $36, respectively	22,265	18,432
Inventory	25,139	24,150
Prepaid expenses and other current assets	8,527	3,764
Total current assets	124,685	111,216
Property, plant, and equipment, net	16,635	12,213
Non-current inventory	2,686	3,531
Other non-current assets	78	251
Total assets	144,084	127,211
Current liabilities:
Accounts payable	11,818	10,575
Accrued expenses and other current liabilities	9,825	7,684
Total current liabilities	21,643	18,259
Asset retirement obligations	1,638	1,573
Other long-term liabilities	29	62
Total liabilities	23,310	19,894
Commitments and contingencies (Note 13)
Shareholders’ equity:
Preferred stock, $0.0001 par value, 5,882 shares authorized; none issued or outstanding	0	0
Common stock, no par value, 50,000 shares authorized; 33,938 shares issued and 27,028 shares outstanding as of September 30, 2017; 33,154 shares issued and 26,244 shares outstanding as of September 30, 2016	730,906	725,666
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	561	579
Accumulated deficit	(562,972)	(571,207)
Total shareholders’ equity	120,774	107,317
Total liabilities and shareholders’ equity	$ 144,084	$ 127,211

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Accounts receivable:
Allowance for doubtful accounts	$ 22	$ 36
Shareholders’ equity:
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,882,000	5,882,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	33,938,000	33,154,000
Common stock, shares outstanding (in shares)	27,028,000	26,244,000
Treasury stock, shares held (in shares)	6,910,000	6,910,000

Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]
Beginning balance (in shares) at Sep. 30, 2014	31,109,000
Balance as of September 30, 2014 at Sep. 30, 2014	$ 112,347	$ 755,368	$ (2,071)	$ 1,837	$ (642,787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,100				63,100
Translation adjustment	(990)			(990)
Stock-based compensation (in shares)		948,000
Stock-based compensation	4,320	$ 4,320
Purchase of treasury stock (in shares)			(6,870,000)
Purchase of treasury stock	(45,650)		$ (45,650)
Stock option exercises (in shares)		290,000
Stock option exercises	1,409	$ 1,409
Issuance of common stock - ESPP (in shares)		121,000
Issuance of common stock - ESPP	493	$ 493
Issuance of common stock - Board of Directors (in shares)		78,000
Issuance of common stock - Board of Directors	$ 413	$ 413
Ending balance (in shares) at Sep. 30, 2015	25,676,000
Balance as of September 30, 2015 at Sep. 30, 2015	$ 135,442	$ 762,003	(47,721)	847	(579,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,266				8,266
Translation adjustment	(268)			(268)
Stock-based compensation (in shares)		284,000
Stock-based compensation	1,868	$ 1,868
Stock option exercises (in shares)		45,000
Stock option exercises	225	$ 225
Special dividend paid	(39,214)	$ (39,214)
Issuance of common stock - ESPP (in shares)		193,000
Issuance of common stock - ESPP	735	$ 735
Issuance of common stock - Board of Directors (in shares)		46,000
Issuance of common stock - Board of Directors	$ 263	$ 263
Ending balance (in shares) at Sep. 30, 2016	26,244,000
Balance as of September 30, 2015 at Sep. 30, 2016	$ 107,317	725,666	(47,721)	579	(571,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative adjustment for adoption of accounting standard		$ (214)			214
Net income	8,235				8,235
Translation adjustment	(18)			(18)
Stock-based compensation (in shares)		432,000
Stock-based compensation	$ 3,602	$ 3,602
Stock option exercises (in shares)	157,879	158,000
Stock option exercises	$ 534	$ 534
Issuance of common stock - ESPP (in shares)		133,000
Issuance of common stock - ESPP	773	$ 773
Issuance of common stock - Board of Directors (in shares)		61,000
Issuance of common stock - Board of Directors	$ 331	$ 331
Ending balance (in shares) at Sep. 30, 2017	27,028,000
Balance as of September 30, 2015 at Sep. 30, 2017	$ 120,774	$ 730,906	$ (47,721)	$ 561	$ (562,972)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 8,235	$ 8,266	$ 63,100
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	3,757	2,506	2,952
Stock-based compensation expense	3,602	2,086	4,586
Deferred income taxes	0	0	24,080
Provision adjustments related to doubtful accounts	23	23	556
Provision adjustments related to product warranty	573	376	838
Change in fair value of financial instruments	0	0	(122)
Gain from change in estimate on ARO obligation	(45)	0	(845)
Reclassification of foreign currency translation adjustment	0	0	(744)
Impairments of equipment	506	0	0
Recognition of previously deferred gain on sale of assets from discontinued operations	0	(3,804)	0
Net (gain) loss on disposal of equipment	(456)	(41)	237
Settlement of customer related warranty claim	0	0	(442)
Other	(5)	(1,422)	(552)
Total non-cash adjustments	7,955	(276)	(58,408)
Changes in operating assets and liabilities:
Accounts receivable	(3,859)	(1,171)	3,526
Inventory	(140)	(10,904)	(3,440)
Other assets	(4,455)	148	359
Accounts payable	2,095	3,179	(3,231)
Accrued expenses and other current liabilities	1,870	(4,794)	(5,823)
Total change in operating assets and liabilities	(4,489)	(13,542)	(8,609)
Net cash provided by (used in) operating activities	11,701	(5,552)	(3,917)
Cash flows from investing activities:
Purchase of equipment	(9,600)	(5,779)	(2,799)
Receipt of escrow funds from sale of assets	0	1,853	0
Proceeds from disposal of property, plant and equipment	474	100	50
Net cash (used in) provided by investing activities	(9,126)	(3,826)	164,169
Cash flows from financing activities:
Payments from borrowings of credit facilities	0	0	(26,518)
Repurchases of common stock	0	0	(45,650)
Payment of special dividend	0	(39,214)	0
Proceeds from stock plans	1,306	960	1,902
Net cash provided by (used in) financing activities	1,306	(38,254)	(70,266)
Effect of exchange rate changes on foreign currency	3	242	105
Net increase (decrease) in cash, cash equivalents and restricted cash	3,884	(47,390)	90,091
Cash, cash equivalents and restricted cash at beginning of period	64,870	112,260	22,169
Cash, cash equivalents and restricted cash at end of period	68,754	64,870	112,260
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	71	88	194
Cash paid during the period for income taxes	114	124	938
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	(861)	282	514
Issuance of common stock to Board of Directors	331	263	413
Photovoltaics Business [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business	0	0	(86,958)
Cash flows from investing activities:
Proceeds from sale of business	0	0	149,936
Digital Products Business [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business	0	0	(1,994)
Cash flows from investing activities:
Proceeds from sale of business	$ 0	$ 0	$ 16,982

Description of Business	12 Months Ended
Description of Business	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Business Overview EMCORE Corporation together with its subsidiaries (referred to herein as the “Company,” “we,” “our,” or “EMCORE”), was established in 1984 as a New Jersey corporation. The Company became publicly traded in 1997 and is listed on the Nasdaq stock exchange under the ticker symbol EMKR. EMCORE pioneered the linear fiber optic transmission technology that enabled the world’s first delivery of Cable TV directly on fiber, and today is a leading provider of advanced Mixed-Signal Optics products that enable communications systems and service providers to meet growing demand for increased bandwidth and connectivity. The Mixed-Signal Optics technology at the heart of our broadband communications products is shared with our fiber optic gyros and inertial sensors to provide the aerospace and defense markets with state-of-the-art navigations systems technology. With both analog and digital circuits on multiple chips, or even a single chip, the value of Mixed-Signal device solutions is often far greater than traditional digital applications and requires a specialized expertise held by EMCORE which is unique in the optics industry. We currently have one reporting segment: Fiber Optics. Sale of Photovoltaics and Digital Products Businesses In the fiscal year ended September 30, 2015, EMCORE completed the sale of the Company's Photovoltaics Business to SolAero Technologies Corporation (“SolAero”) pursuant to the Asset Purchase Agreement (the “Photovoltaics Agreement”) under which SolAero acquired substantially all of the assets, and assumed substantially all of the liabilities, primarily related to or used in connection with the Company's Photovoltaics Business, including EMCORE's subsidiaries EMCORE Solar Power, Inc. and EMCORE IRB Company, LLC (collectively, the “Photovoltaics Business” and, the sale of the Photovoltaics Business, the “Photovoltaics Asset Sale”), for $149.9 million in cash. In the fiscal year ended September 30, 2015, EMCORE completed the sale of the Company's telecommunications business (the “Digital Products Business”) to NeoPhotonics Corporation, a Delaware corporation (“NeoPhotonics”), pursuant to the Asset Purchase Agreement (the “Digital Products Agreement”), under which NeoPhotonics acquired certain assets, and certain liabilities, related to the Company's Digital Products Business for an aggregate purchase price of $17.5 million. On January 2, 2015, EMCORE completed the sale of the Digital Products Business for $1.5 million in cash and a promissory note in the principal amount of $16.0 million (the "Promissory Note"). On April 16, 2015, EMCORE and NeoPhotonics entered into an agreement to adjust the purchase price for the Digital Products Business, resulting in an adjusted balance of the Promissory Note of $15.5 million. On April 17, 2015, NeoPhotonics paid in full the outstanding balance of the Promissory Note of $15.5 million, plus accrued interest of $0.2 million. No Photovoltaics Business or Digital Products Business assets or liabilities that were sold remain on the consolidated balance sheet as of September 30, 2017 or September 30, 2016. The financial results of the Photovoltaics Business and the Digital Products Business are presented as “discontinued operations” on the consolidated statements of operations and comprehensive income for the fiscal years ended September 30, 2017, 2016 and 2015. See Note 5 - Discontinued Operations for additional information. The notes to our consolidated financial statements relate to our continuing operations only, unless otherwise indicated. Liquidity and Capital Resources Historically, we have consumed cash from operations and until recently, in most periods we have incurred operating losses from continuing operations. We have managed our liquidity position through the sale of assets, and cost reduction initiatives, as well as from time to time in prior periods, borrowings from our Credit Facility and capital markets transactions. On December 10, 2014, we completed the sale of our Photovoltaics Business for 150.0 million in cash prior to working capital adjustments of $0.1 million. On January 2, 2015, we completed the sale of our Digital Products Business for $1.5 million in cash and an adjusted Promissory Note balance of $15.5 million. On April 17, 2015, NeoPhotonics paid in full the outstanding balance of the Promissory Note of $15.5 million, plus accrued interest of $0.2 million. On June 15, 2015, we completed the modified "Dutch auction" tender offer (the "Tender Offer") and purchased 6.9 million shares of our common stock at a purchase price of $6.55 per share, for an aggregate cost of $45.0 million excluding fees and expenses. Repurchased common stock was recorded to treasury stock. The Company incurred costs of $0.7 million in connection with the Tender Offer, which were recorded to treasury stock. As of September 30, 2017, cash and cash equivalents totaled $68.3 million and net working capital totaled approximately $103.0 million. Net working capital, calculated as current assets minus current liabilities, is a financial metric we use which represents available operating liquidity. For the fiscal year ended September 30, 2017, we earned net income of $8.2 million.

Summary of Significant Accounting Policies

12 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Principles of Consolidation: Our consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) and include the assets, liabilities, shareholders' equity, and operating results of the Company and its wholly owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. We are not the primary beneficiary of, nor do we hold a significant variable interest in, any variable interest entity.

Use of Estimates: The preparation of consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities, as of the date of the financial statements, and the reported amounts of revenue and expenses during the reported period. The accounting estimates that require our most significant, difficult, and/or subjective judgments include:


•	the valuation of inventory and stock-based compensation;


•	the useful lives of assets and assessment of recovery of long-lived assets;


•	asset retirement obligations and contingencies, including litigation and indemnification-related;


•	the allowance for doubtful accounts and warranty accruals; and,


•	the valuation allowance for deferred tax assets.

We develop estimates based on historical experience and on various assumptions about the future that are believed to be reasonable based on the best information available to us. Our reported financial position or results of operations may be materially different under changed conditions or when using different estimates and assumptions, particularly with respect to significant accounting policies. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information.

Concentration of Credit Risk: Financial instruments that may subject us to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. Our cash and cash equivalents are held in safekeeping primarily with Wells Fargo. When necessary, we perform credit evaluations on our customers' financial condition and occasionally we request deposits in advance of shipping product to our customers. These financial evaluations require significant judgment and are based on a variety of factors including, but not limited to, current economic trends, historical payment patterns, bad debt write-off experience, and financial review of the particular customer.

Cash and Cash Equivalents: Cash and cash equivalents consists primarily of bank deposits and highly liquid short-term investments with a maturity of three months or less at the time of purchase.

Restricted Cash: Restricted cash represents recently deposited cash that is temporarily restricted by our bank in accordance with the terms of the outstanding credit facility.

Accounts Receivable: We regularly evaluate the collectability of our accounts receivable and maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to meet their financial obligations to us. The allowance is based on the age of receivables and a specific identification of receivables considered at risk of collection. We classify charges associated with the allowance for doubtful accounts as selling, general, and administrative expense.

Inventory: Inventory is stated at the lower of cost or market (first-in, first-out). Inventory that is expected to be used within the next 12 months is classified as current inventory. We write-down inventory once it has been determined that conditions exist that may not allow the inventory to be sold for its intended purpose or the inventory is determined to be excess or obsolete based on assumptions about future demand and market conditions. The charge related to inventory write-downs is recorded as a cost of revenue. We evaluate inventory levels at least quarterly against sales forecasts on a significant part-by-part basis, in addition to determining its overall inventory risk. We have incurred, and may in the future incur charges to write-down our inventory. See Note 8 - Inventory in the notes to the consolidated financial statements for additional information related to our inventory.

Property, Plant, and Equipment: Our property, plant, and equipment are recorded at cost. Plant and equipment are depreciated on a straight-line basis over the following estimated useful lives of the assets:



Estimated Useful Life
Equipment		three to ten years
Furniture and fixtures		five years
Computer hardware and software		five to seven years
Leasehold improvements		three to six years

Leasehold improvements are amortized over the lesser of the asset life or the lease term. Expenditures for repairs and maintenance are charged to expense as incurred. The costs for major renewals and improvements are capitalized and depreciated over their estimated useful lives of the related asset. The cost and related accumulated depreciation of the assets are removed from the accounts upon disposition and any resulting gain or loss is reflected in the consolidated statement of operations and comprehensive income.

Valuation of Long-lived Assets: Long-lived assets consist primarily of property, plant, and equipment, net. Since our long-lived assets are subject to amortization, we review these assets for impairment in accordance with the provisions of Accounting Standards Codification ("ASC") 360, Property, Plant, and Equipment. We review long-lived assets for impairment whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. Our impairment testing of long-lived assets consists of determining whether the carrying amount of the long-lived asset (asset group) is recoverable, in other words, whether the sum of the future undiscounted cash flows expected to result from the use and eventual disposition of the asset (asset group) exceeds its carrying amount. The determination of the existence of impairment involves judgments that are subjective in nature and may require the use of estimates in forecasting future results and cash flows related to an asset or group of assets. In making this determination, we use certain assumptions, including estimates of future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, the length of service that assets will be used in our operations, and estimated salvage values.

Asset Retirement and Environmental Obligations: Pursuant to ASC 410, Asset Retirement and Environmental Obligations, an asset retirement obligation (“ARO” or “AROs”) is recorded when there is a legal obligation associated with the retirement of a tangible long-lived asset and the fair value of the liability can reasonably be estimated. Upon initial recognition of an asset retirement obligation, a company increases the carrying amount of the long-lived asset by the same amount as the liability. Over time, the liabilities are accreted for the change in their present value through charges to operations costs. The initial capitalized costs are depleted over the useful lives of the related assets through charges to depreciation, and/or amortization. If the fair value of the estimated ARO changes, an adjustment is recorded to both the ARO and the asset retirement cost. Revisions in estimated liabilities can result from revisions of estimated inflation rates, escalating retirement costs, and changes in the estimated timing of settling ARO liabilities.

We have known asset retirement conditions, such as certain asset decommissioning and restoration of rented facilities to be performed in the future.

Fair Value of Financial Instruments: We determine the fair value of our financial instruments in accordance with ASC 820, Fair Value Measurements and Disclosures.

Revenue Recognition: Revenue is recognized upon shipment, provided persuasive evidence of a contract exists, the price is fixed, the product meets our customer's specifications, title and ownership have transferred to the customer, and there is reasonable assurance of collection of the sales proceeds. The majority of our products have shipping terms that are free on board or free carrier alongside (“FCA”) shipping point, which means that we fulfill our delivery obligation when the goods are handed over to the freight carrier at our shipping dock. This means the customer bears all costs and risks of loss or damage to the goods from that point. We account for shipping and related transportation costs by recording the charges that are invoiced to customers as revenue, with the corresponding cost recorded as cost of revenue. In those instances where inventory is maintained at a consigned location, revenue is recognized only when our customer pulls product for use and after title and ownership has transferred to the customer. Any warranty cost and remaining obligations that are inconsequential or perfunctory are accrued when the corresponding revenue is recognized.

Distributors: We use a number of distributors around the world and recognize revenue upon shipment of product to these distributors. Title and risk of loss pass to the distributors upon shipment, and our distributors are contractually obligated to pay us on standard commercial terms, just like direct customers. We do not sell to our distributors on consignment and, except in the event of product discontinuance, do not give distributors a right of return.

Contract Manufacturers: Prior to certain customers accepting product that is manufactured at one of our contract manufacturers, these customers require that they first qualify the product and manufacturing processes at our contract manufacturer. The customers' qualification process determines whether the product manufactured at our contract manufacturer achieves their quality, performance, and reliability standards. After a customer completes the initial qualification process, we receive approval to ship qualified product to that customer. As part of the manufacturing process at our contract manufacturers, the finished product is tested prior to shipment to the customer using the same criteria that our customer uses to test product it receives. Revenue is recognized upon shipment of customer-qualified product, provided persuasive evidence of a contract exists, the price is fixed, the product meets our customer's specifications, title and ownership have transferred to the customer, and there is reasonable assurance of collection of the sales proceeds.

Product Warranty Reserves: We provide our customers with limited rights of return for non-conforming shipments and warranty claims for certain products. Pursuant to ASC 450, Contingencies, we make estimates of product warranty expense using historical experience rates as a percentage of revenue and accrue estimated warranty expense as a cost of revenue. We estimate the costs of our warranty obligations based on historical experience of known product failure rates and anticipated rates of warranty claims, use of materials to repair or replace defective products, and service delivery costs incurred in correcting product issues. In addition, from time to time, specific warranty accruals may be made if unforeseen technical problems arise. Should our actual experience relative to these factors differ from our estimates, we may be required to record additional warranty reserves. Alternatively, if we provide more reserves than needed, we may reverse a portion of such provisions in future periods.

Litigation Contingencies: We are subject to various legal proceedings, claims, and litigation, either asserted or unasserted that arise in the ordinary course of business. Professional legal fees are expensed when incurred. We accrue for contingent losses when such losses are probable and reasonably estimable. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information. Should we fail to prevail in any legal matter or should several legal matters be resolved against the Company in the same reporting period, then the financial results of that particular reporting period could be materially affected.

Research and Development: Research and development costs are charged as an expense when incurred.

Stock-Based Compensation: Stock-based compensation expense is measured at the stock option or award grant date, based on the fair value of the award, and is recorded to cost of revenue, sales, general, and administrative, and research and development expense based on an employee's responsibility and function over the requisite service period. We use the Black-Scholes option-pricing model or the Monte-Carlo lattice model and the straight-line attribution approach to determine the fair value of stock-based awards in accordance with ASU 2016-09, Compensation. These option-pricing models require the input of highly subjective assumptions, including the option's expected life, the expected volatility of the price of the Company’s common stock, risk-free interest rates and the expected dividend yield of the Company’s common stock. Stock-based compensation expense is reduced for forfeitures.

During fiscal year 2017, the Company early adopted Accounting Standards Update (“ASU”) 2016-09. ASU 2016-09 introduces targeted amendments intended to simplify the accounting for stock compensation, including the Company's election to eliminate the requirements to estimate the number of awards that are expected to vest, and instead, account for forfeitures when they occur. The new standard requires the change be adopted using the modified retrospective approach. As such, the Company recorded a cumulative-effect adjustment of $0.2 million to decrease the September 30, 2016 accumulated deficit and common stock balances.

Foreign Exchange: We recognize gains and losses due to the effect of exchange rate changes on foreign currency primarily due to our operations in China. The assets and liabilities of our foreign operations are translated from their respective functional currencies into U.S. dollars at the rates in effect at the consolidated balance sheet dates, and the revenue and expense amounts are translated at the average rate during the applicable periods reflected on the consolidated statements of operations and comprehensive income. Foreign currency translation adjustments are recorded as other comprehensive income. Gains and losses from foreign currency transactions denominated in currencies other than the U.S. dollar, both realized and unrealized, are recorded as foreign exchange (loss) gain on our consolidated statements of operations and comprehensive income.

Income Taxes: In accordance with ASC 740, Income Taxes, deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities and their reported amounts. We record valuation allowances against all deferred tax assets for amounts which are not considered more likely to be realized.

Comprehensive Income: ASC 220, Comprehensive Income, establishes standards for reporting and display of comprehensive income and its components in financial statements. It requires that all items that are required to be recognized under accounting standards as components of comprehensive income be reported in the financial statement that is displayed with the same prominence as other financial statements. Our comprehensive income consists of both net income and foreign currency translation adjustments and it is presented in the accompanying consolidated statements of operations and comprehensive income.

Income (Loss) Per Share: We are required, in periods in which we have net income, to calculate basic and diluted income per share using the two-class method. The two-class method is required because our unvested restricted stock awards are considered participating securities as these securities have the right to receive dividends or dividend equivalents should we declare dividends on our common stock. Under the two-class method, during periods of net income, net income is first reduced for distributions declared on all classes of securities to arrive at undistributed earnings. The undistributed earnings are then allocated on a pro-rata basis between the common shareholders and participating securities holders. The weighted-average number of common shares and participating securities outstanding during the period is then used to calculate basic and diluted income per share.

In periods in which we have a net loss, basic loss per share is calculated by dividing the loss attributable to common shareholders by the weighted-average number of common shares outstanding during the period.

Recent Accounting Pronouncements

12 Months Ended

Sep. 30, 2017

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

There have been no recent accounting pronouncements or changes in accounting pronouncements that are of significance, or of potential significance, to us other than those discussed below:

•

In May 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-09, Compensation — Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. The new guidance is intended to reduce diversity in practice and result in fewer changes to the terms of an award being accounted for as a modification. Under ASU 2017-09, an entity will not apply modification accounting to a share-based payment award if the award’s fair value, vesting conditions and classification as an equity or liability instrument are the same immediately before and after the change. ASU 2017-09 will be applied prospectively to awards modified on or after the adoption date. The new guidance is effective for annual periods, beginning after December 15, 2017 and interim periods within those annual periods. The Company does not expect the adoption of ASU 2017-09 will have a material impact on the Company’s consolidated financial statements.

•

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which provides amendments to current guidance to address the classification and presentation of changes in restricted cash or restricted cash equivalents. Specifically, there is no guidance to address how to classify and present changes in restricted cash or restricted cash equivalents that occur when there are transfers between cash, cash equivalents and restricted cash or restricted cash equivalents and when there are direct cash receipts into restricted cash or restricted cash equivalents. The new guidance is effective for annual periods beginning after December 15, 2017 and interim periods within those annual periods. Early adoption is permitted. This standard requires the use of the retrospective transition method. The Company early adopted ASU 2016-18 at the beginning of fiscal year 2017. Accordingly, for the fiscal years ended September 30, 2017, 2016 and 2015, the Company reclassified restricted cash to be presented with cash and cash equivalents on the consolidated statements of cash flows in the amount of $0.4 million, $1.0 million and $0.4 million, respectively.

•

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which clarifies how companies present and classify certain cash receipts and cash payments in the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017. Early adoption is permitted. The Company early adopted ASU 2016-15 at the beginning of fiscal year 2017, but there was no impact on our Consolidated Financial Statements.

•

In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. This guidance is effective for annual periods beginning after December 15, 2016, and interim periods, within those annual periods. Early adoption is permitted. During fiscal year 2017, the Company early adopted ASU 2016-09. ASU 2016-09 introduces targeted amendments intended to simplify the accounting for stock compensation, including the Company's election to eliminate the requirements to estimate the number of awards that are expected to vest, and instead, account for forfeitures when they occur. The new standard requires the change be adopted using the modified retrospective approach. As such, the Company recorded a cumulative-effect adjustment of $0.2 million to decrease the September 30, 2016 accumulated deficit and common stock balances.

The ASU also requires income tax benefits and deficiencies to be recognized as income tax expense or benefit in the income statement and the tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. The income tax consequences of the new standard did not have an impact on the consolidated financial statements. Excess tax benefits should be classified along with other income tax cash flows as an operating activity. The new standard also generally requires presentation of cash paid by the employer for employee taxes as a financing activity. The Company has historically not withheld shares from employees for any of their share-based payment awards, and thus, the new standard did not have an impact on the consolidated statement of cash flows.

•

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 introduces a lessee model that requires recognition of assets and liabilities arising from qualified leases on the consolidated balance sheets and disclosure of qualitative and quantitative information about lease transactions. This guidance is effective for fiscal years beginning after December 15, 2018 and interim periods within those years. The new standard will be effective for our fiscal year beginning October 1, 2019 and early adoption is permitted.

This update will be applied using a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company anticipates taking advantage of the practical expedient option. The operating lease obligations at September 30, 2017 were approximately $4.3 million. Assuming an average discounted rate of 4% applied to these minimum remaining rental payments, we estimate that the impact to our balance sheet upon adoption would be within the range of $1.8 million to $2.8 million due to recognition of the right-of-use asset and lease liability related to current operating leases. The Company is continuing to evaluate the effect of this update on its consolidated financial statements and related disclosures.

•

In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory. This standard requires inventory to be measured at the lower of cost and net realizable value. The guidance clarifies that net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. This guidance is effective for fiscal years beginning after December 15, 2016 and interim periods within those fiscal years. The new standard will be effective for our fiscal year beginning October 1, 2017 and early adoption is permitted. We are currently evaluating the impact of this accounting standard update on our consolidated financial statements.

•

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers which will supersede most current U.S. GAAP guidance on this topic. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing to clarify two aspects of the guidance within ASU No. 2014-09 on identifying performance obligations and the licensing implementation guidance. Under the new standards, recognition of revenue occurs when the seller satisfies a performance obligation by transferring to the customer promised goods or services in an amount that reflects the consideration the entity expects to receive for those goods or services. The new standard, as amended through December 2016, will be effective for our fiscal year beginning October 1, 2018 and early adoption is permitted as of October 1, 2017. The standard permits the use of either the retrospective or cumulative effect transition method. We have established a cross-functional coordinated implementation team to implement ASU 2014-09. We are in the process of identifying and implementing changes to our systems, processes and internal controls to meet the reporting and disclosure requirements.

Upon evaluation, we believe that the key revenue streams will be split between product sales and firm fixed price contracts, which comprise the majority of our business. Based upon the evaluation completed to date, the Company believes that the pattern of revenue recognition for these revenue streams will generally be at a point-in-time for product sales and over a period of time for firm fixed price contracts, which is consistent with current guidance. The Company does not believe the adoption of ASU 2014-09 will have a material impact on the Company’s financial statements and related disclosures. As of September 30, 2017, the Company intends to adopt ASU 2014-09 utilizing a fully retrospective transition approach on October 1, 2018.

Cash, Cash Equivalents and Restricted Cash

12 Months Ended

Sep. 30, 2017

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalent and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the audited statements of cash flows:



	As of		As of		As of
(in thousands)	September 30, 2017		September 30, 2016		September 30, 2015
Cash	$	8,054	$	3,989	$	8,162
Cash equivalents	$	60,279	$	59,916	$	103,723
Restricted cash	421		965		375
Total cash, cash equivalents and restricted cash	$	68,754	64,870		112,260

The Company's restricted cash includes cash balances which are legally or contractually restricted to use. The Company's restricted cash is included in current assets as of September 30, 2017, 2016 and 2015.

Discontinued Operations

12 Months Ended

Sep. 30, 2017

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Sale of Photovoltaics Business

The following table presents the statements of operations for the discontinued operations of the Photovoltaics Business:



	For the Fiscal Years Ended September 30,
(in thousands)	2017			2016			2015
Revenue	$	—		$	—		$	12,614
Cost of revenue	12			(159		)	8,245
Gross loss	(12		)	159			4,369
Operating expense (income)	13			(868		)	2,240
Other income	—			—			779
Gain on sale of discontinued operations	—			—			86,958
(Loss) income from discontinued operations before income tax expense	(25		)	1,027			89,866
Income tax benefit (expense)	—			20			(28,700		)
(Loss) income from discontinued operations, net of tax	$	(25	)	$	1,047		$	61,166

On December 22, 2015, we settled all of the outstanding rights and obligations of a solar power venture in Spain, including outstanding non-current receivables, for a payment of $0.7 million. The outstanding non-current receivables had a net book value of $0 at the time of settlement as they were fully allowed for previously. The resulting gain was recorded in the discontinued operations of the Photovoltaics Business for the fiscal year ended September 30, 2016.

Included in discontinued operations of the Photovoltaics Business during the fiscal year ended September 30, 2016 were $0.4 million of New Mexico incentive tax credits received. There were no incentive tax credits received during the fiscal years ended September 30, 2017 and 2015.

Sale of Digital Products Business

The following table presents the statements of operations for the discontinued operations of the Digital Products Business:



	For the Fiscal Years Ended September 30,
(in thousands)	2017		2016			2015
Revenue	$	—	$	—		$	11,944
Cost of revenue	—		(500		)	9,107
Gross profit	—		500			2,837
Operating expense (income)	2		(292		)	2,800
Recognition of previously deferred gain on sale of assets	—		3,804			—
Gain on sale of discontinued operations	—		—			1,994
Other income	41		—			—
Income from discontinued operations before income tax expense	39		4,596			2,031
Income tax benefit (expense)	—		4			2,175
Income from discontinued operations, net of tax	$	39	$	4,600		$	4,206

In December 2015, we entered into an agreement to terminate our lease and related obligations associated with a facility in Newark, California which we abandoned effective February 2016 following the sale of the Digital Products Business. As a result of this agreement, we paid $0.2 million and recorded a gain of $0.3 million on the lease termination in the discontinued operations of the Digital Products Business during the fiscal year ended September 30, 2016. Also see Note 10 - Accrued Expenses and Other Current Liabilities.

Included in cost of revenue for the fiscal year ended September 30, 2016 is $0.4 million due to a reduction in expected product warranty liabilities from a settlement associated with the Digital Products Business.

During the fiscal year ended September 30, 2016, we recognized the deferred gain of $3.4 million and reversal of other liabilities of $0.4 million, that had been recorded as of September 30, 2015, resulting in a credit of $3.8 million to deferred gain on sale of assets within discontinued operations of the Digital Products Business as the result of the favorable ruling from the Sumitomo Electric Industries, LTD (“SEI”) arbitration. Also see Note 13- Commitments and Contingencies.

Fair Value Accounting

12 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Accounting

ASC Topic 820 (“ASC 820”), Fair Value Measurements, establishes a valuation hierarchy for disclosure of the inputs to valuation techniques used to measure fair value. This standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value:


•	Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities.


•	Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the assets or liabilities, either directly or indirectly, through market corroboration, for substantially the full term of the financial instrument.


•	Level 3 inputs are unobservable inputs based on our own assumptions used to measure assets or liabilities at fair value.

Classification of an asset or liability within this hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

Valuation techniques used to measure fair value under ASC 820 must maximize the use of observable inputs and minimize the use of unobservable inputs.

Cash consists primarily of bank deposits or highly liquid short-term investments with a maturity of three months or less at the time of purchase. Restricted cash represents temporarily restricted deposits held as compensating balances against short-term borrowing arrangements.

The carrying amounts of cash and cash equivalents, restricted cash, accounts receivable, other current assets, and accounts payable approximate fair value because of the short maturity of these instruments.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accounts Receivable

12 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Accounts Receivable

The components of accounts receivable consisted of the following:



	As of			As of
(in thousands)	September 30, 2017			September 30, 2016
Accounts receivable, gross	$	22,287		$	18,468
Allowance for doubtful accounts	(22		)	(36		)
Accounts receivable, net	$	22,265		$	18,432

The allowance for doubtful accounts is based on the age of receivables and a specific identification of receivables considered at risk of collection.

The following table summarizes changes in the allowance for doubtful accounts for the fiscal years ended September 30, 2017, 2016 and 2015.



Allowance for Doubtful Accounts (in thousands)	For the Fiscal Years Ended September 30,
	2017			2016			2015
Balance at beginning of period	$	36		$	462		$	116
Provision adjustment - expense, net of recoveries	23			23			556
Write-offs and other adjustments - deductions to receivable balances	(37		)	(449		)	(210		)
Balance at end of period	$	22		$	36		$	462

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Property, Plant, and Equipment, net

12 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment, net

The components of property, plant, and equipment, net consisted of the following:



	As of			As of
(in thousands)	September 30, 2017			September 30, 2016
Equipment	$	31,507		$	28,247
Furniture and fixtures	1,109			1,109
Computer hardware and software	2,974			2,860
Leasehold improvements	2,330			1,896
Construction in progress	4,539			1,779
Property, plant, and equipment, gross	$	42,459		35,891
Accumulated depreciation	(25,824		)	(23,678		)
Property, plant, and equipment, net	$	16,635		$	12,213

Depreciation expense totaled $3.7 million, $2.4 million and $2.1 million during the fiscal years ended September 30, 2017, 2016 and 2015, respectively.

Impairment Testing

In March 2017, in connection with the transition of our manufacturing operations in China to a new manufacturing facility in China, we identified equipment with a net book value of approximately $0.6 million that would no longer be utilized after the completion of the move later in fiscal year 2017. After taking into consideration the costs of disposal and estimated net funds from the sale of the equipment of approximately $0.1 million, we recorded a charge to impairments of approximately $0.5 million in the fiscal year ended September 30, 2017.

As of September 30, 2016, we determined no impairment triggers were present, and therefore, an impairment test was not performed.

As of September 30, 2015, we performed an impairment test on long-lived assets. The impairment test was triggered by continued losses from operations realized in fiscal year 2015. The impairment testing indicated that no impairment existed and that future undiscounted cash flows exceeded the carrying value.

Accrued Expenses and Other Current Liabilities

12 Months Ended

Sep. 30, 2017

Payables and Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

The components of accrued expenses and other current liabilities consisted of the following:



	As of		As of
(in thousands)	September 30, 2017		September 30, 2016
Compensation	$	3,904	$	3,628
Warranty	684		871
Professional fees	653		761
Customer deposits	20		38
Income and other taxes	2,920		944
Severance and restructuring accruals	628		642
Other	1,016		800
Accrued expenses and other current liabilities	$	9,825	$	7,684

Compensation: Compensation is primarily comprised of accrued employee salaries, taxes and benefits.

Income and other taxes: For the fiscal year ended September 30, 2017, the Company recorded approximately $0.2 million of income tax expense from continuing operations and $0 of income tax benefit within income from discontinued operations. For the fiscal year ended September 30, 2016, the Company recorded $14,000 of income tax expense from continuing operations income and $24,000 of income tax benefit within income from discontinued operations. For the fiscal year ended September 30, 2015, the Company recorded $2.2 million of income tax benefit from continuing operations losses and $26.5 million of income tax expense within income from discontinued operations. The income tax expense within discontinued operations includes estimated alternative minimum tax and other adjustments prescribed by ASC 740 in allocating expected annual income tax expense (benefit) between continuing operations and discontinued operations.

Severance and restructuring accruals: In connection with the abandonment of our Newark, California facility following the closing of the sale of the Digital Products Business, we accrued for the remaining lease costs through the lease termination in May 2016. In December 2015, we entered into an agreement to terminate this lease and related obligations, including AROs, as of February 2016 for a payment of $0.2 million. As a result of the agreement, we recorded a gain of $0.3 million on the lease termination. The resulting gain was recorded in the discontinued operations of the Digital Products Business for the fiscal year ended September 30, 2016. See Note 4 - Discontinued Operations.

On June 7, 2016, the Company's former Chief Financial Officer (“CFO”) notified the Company that he would resign as the Company's CFO, effective as of June 20, 2016 (the “Separation Date”). The Company and the former CFO entered into a separation agreement and general release, dated June 7, 2016 (the “Separation Agreement”), which includes mutual releases by the former CFO and the Company of all claims related to his employment and service relationship with, and termination of employment and service from, the Company. The Separation Agreement provides for, among other things, the continuation of his base salary for 64 weeks, benefits for 16 months, outplacement services for a period of not more than 1 year and with a value not in excess of $15,000 and immediate vesting of all his outstanding non-vested equity awards, other than his most recent equity award. These payments are not contingent upon any future service by the former CFO. The Company recorded a charge of approximately $0.4 million in the fiscal year ended September 30, 2016 related to this Separation Agreement.

In an effort to better align our current and future business operations, in May 2016 the Company announced a reduction in its workforce by approximately 30 individuals and recorded a charge for severance for the affected employees in the amount of $0.3 million in the fiscal year ended September 30, 2016. In November 2016, the Company announced an additional reduction in the workforce of approximately 5 individuals and recorded a charge of $0.2 million in the fiscal year ended September 30, 2017 related to the outsourcing of our satellite communications assembly operations. In September 2017, the Company announced it would be closing its Ivyland, Pennsylvania location during fiscal year 2018 and reducing its workforce by approximately 11 individuals and recorded a charge for severance for the affected employees in the amount of $0.3 million in the fiscal year ended September 30, 2017.

In March 2017, the Company announced an additional workforce reduction of approximately 14 individuals and recorded a charge of $0.1 million in the fiscal year ended September 30, 2017 related to the outsourcing of our wafer fabrication lab. During the fiscal year ended September 30, 2017, the Company recorded an additional charge of $0.4 million for six additional individuals related to the March 2017 workforce reduction. Also, in March 2017, in connection with our opening of a new manufacturing facility in China to reduce costs and improve efficiency later in fiscal year 2017, we accrued for a workforce reduction of approximately 265 individuals and recorded a charge of $0.5 million in the fiscal year ended September 30, 2017. During the fiscal year ended September 30, 2017, the Company recorded an additional charge of $0.4 million for the workforce reduction of 72 additional individuals related to the opening of our new manufacturing facility in China.

Our severance and restructuring-related accruals specifically relate to the separation agreements and reductions in force discussed above and non-cancelable obligations associated with an abandoned leased facility. Expense related to severance and restructuring accruals is included in selling, general, and administrative expense on our statements of operations and comprehensive income. The following table summarizes the changes in the severance accrual account:



(in thousands)	Severance-related accruals			Restructuring- related accruals			Total
Balance as of September 30, 2015	$	1,110		$	338		$	1,448
Expense - charged to accrual	728			—			728
Payments and accrual adjustments	(1,196		)	(338		)	(1,534		)
Balance as of September 30, 2016	$	642		$	—		$	642
Expense - charged to accrual	1,994			—			1,994
Payments and accrual adjustments	(2,008		)	—			(2,008		)
Balance as of September 30, 2017	$	628		$	—		$	628

Warranty: The following table summarizes the changes in our product warranty accrual accounts:



Product Warranty Accruals	For the Fiscal Years Ended September 30,
(in thousands)	2017			2016			2015
Balance at beginning of period	$	871		$	1,664		$	2,816
Provision for product warranty - expense	573			376			838
Adjustments and utilization of warranty accrual	(760		)	(1,169		)	(1,990		)
Balance at end of period	$	684		$	871		$	1,664

Credit Facilities	12 Months Ended
Credit Facilities	Sep. 30, 2017
Debt Disclosure [Abstract]
Credit Facilities	Credit Facilities On November 11, 2010, we entered into a Credit and Security Agreement (the “Credit Facility”) with Wells Fargo Bank, N.A.. The Credit Facility is secured by the Company's assets and is subject to a borrowing base formula based on the Company's eligible accounts receivable, inventory, and machinery and equipment accounts. On November 10, 2015, we entered into a Seventh Amendment of the Credit Facility which extended the maturity date of the facility to November 2018. On July 27, 2017, we entered into a Ninth Amendment of the Credit Facility which adjusted the interest rate to LIBOR plus 1.75%. The Credit Facility currently provides us with a revolving credit line of up to $15.0 million that can be used for working capital requirements, letters of credit, and other general corporate purposes. As of September 30, 2017, there were no amounts outstanding under this Credit Facility and the Company was in compliance with all financial covenants. Also, as of September 30, 2017, the Credit Facility had approximately $0.5 million reserved for one outstanding stand-by letter of credit and $8.0 million available for borrowing. As of November 30, 2017, there was no outstanding balance under this Credit Facility.

Income and other Taxes

12 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income and other Taxes

The Company's income (loss) from continuing operations before income taxes consisted of the following:



Income (loss) from continuing operations before income taxes	For the Fiscal Years Ended September 30,
(in thousands)	2017			2016		2015
Domestic	$	10,632		$	1,735	$	(5,713	)
Foreign	(2,248		)	898		1,250
Income (loss) from continuing operations before income taxes	$	8,384		$	2,633	$	(4,463	)

The Company's income tax expense (benefit) consisted of the following:



Income tax expense (benefit)	For the Fiscal Years Ended September 30,
(in thousands)	2017		2016			2015
Federal:
Current	$	135	$	—		$	—
Deferred	—		—			(1,835		)
	135		—			(1,835		)
State:
Current	28		(117		)	—
Deferred	—		—			(356		)
	28		(117		)	(356		)
Foreign:
Current	—		131			—
Deferred	—		—			—
	—		131			—
Total income tax expense (benefit)	$	163	$	14		$	(2,191	)

EMCORE Corporation is incorporated in the state of New Jersey. A reconciliation of the provision for income taxes, with the amount computed by applying the statutory U.S. federal and state income tax rates to continuing operations income before provision for income taxes is as follows:



Provision for Income Taxes	For the Fiscal Years Ended September 30,
(in thousands)	2017			2016			2015
Income tax benefit computed at U.S. federal statutory rate	$	2,841		$	896		$	(1,518	)
State tax expense benefit, net of U.S. federal effect	414			(41		)	(356		)
Foreign tax rate differential	229			(94		)	(269		)
Effect due to change in tax rate	2,528			626			—
Windfall from stock based compensation	(150		)	—			—
Other	126			(57		)	108
State net operating loss carryforward adjustment	933			685			—
Change in valuation allowance	(6,758		)	(2,001		)	(156		)
Income tax expense (benefit)	$	163		$	14		$	(2,191	)
Effective tax rate	1.9		%	0.5		%	49.1		%

Significant components of our deferred tax assets are as follows:



Deferred Tax Assets	As of September 30, 2017			As of September 30, 2016
(in thousands)	As of September 30, 2017			As of September 30, 2016
Deferred tax assets:
Federal net operating loss carryforwards	$	144,455		$	147,449
Foreign net operating loss carryforwards	587			51
Income tax credit carryforwards	3,211			3,062
Inventory reserves	2,037			2,614
Accounts receivable reserves	8			14
Accrued warranty reserve	249			328
State net operating loss carryforwards	4,525			7,009
Stock compensation	2,367			3,334
Deferred compensation	349			896
Fixed assets and intangibles	136			124
Other	927			728
Total deferred tax assets	158,851			165,609
Valuation allowance	(158,851		)	(165,609		)
Net deferred tax assets	$	—		$	—

At September 30, 2014, the Company determined that it was more likely than not that certain deferred tax assets would be realized upon the sale of the Photovoltaic Business in fiscal year 2015. As a result, a net deferred tax valuation allowance release of $24.6 million was recorded as an income tax benefit during fiscal year 2014. The sale of the Photovoltaic Business closed on December 10, 2014 and the Company realized a gain on the transaction.

During the fiscal year ended September 30, 2015, the Company utilized the $24.6 million of deferred tax assets. The Company paid alternative minimum taxes of $0.6 million during the fiscal year ended September 30, 2015 and the remaining income tax expense will be offset mainly through utilization of $24.1 million of capital loss and utilization of net operating loss carry forwards.

For the fiscal years ended September 30, 2017, 2016 and 2015, the Company recorded income tax (expense) benefit from continuing operations of approximately $(0.2) million, $0 and $2.2 million, respectively. For the fiscal years ended September 30, 2017, 2016 and 2015, the Company recorded income tax benefit (expense) from discontinued operations of approximately $0, $24,000 and $(26.5) million, respectively. Income tax expense is comprised of estimated alternative minimum tax allocated between continuing operations and discontinued operations as prescribed by ASC 740 and foreign tax expense included within continuing operations.

For the fiscal years ended September 30, 2017, 2016 and 2015, the effective tax rate on continuing operations was 1.9%, 0.5%, and 49.1%, respectively. The higher tax rate for fiscal year 2017 was primarily due to higher alternative minimum tax as a result of the increase in net income. The lower tax rate for fiscal year 2016 was primarily due to permanent differences, state tax benefits, foreign tax rate differentials and changes in the Company's results in the current year as compared to the prior year. The higher tax rate for fiscal year 2015 was primarily due to permanent differences, state tax benefits and foreign tax rate differentials. The Company uses estimates to forecast the results from continuing operations for the current fiscal year as well as permanent differences between book and tax accounting.

We have not provided for U.S. federal and state income taxes on non-U.S. subsidiaries' undistributed earnings as of September 30, 2017 because we plan to indefinitely reinvest the unremitted earnings of our non-U.S. subsidiaries.

All deferred tax assets have a full valuation allowance at September 30, 2017. However, on a quarterly basis, the Company will evaluate the positive and negative evidence to assess whether the more likely than not criteria, mandated by ASC 740, has been satisfied in determining whether there will be further adjustments to the valuation allowance.

During the fiscal year ended September 30, 2017, we increased previously unrecognized tax benefits by $0.1 million related to foreign taxes. During the fiscal years ended September 30, 2016 and 2015, we decreased previously unrecognized tax benefits by $0.1 million and $0.2 million, respectively. Of the fiscal year 2016 amount of unrecognized tax benefits, $112,800 was recognized in income tax expense from continuing operations and $12,000 was recognized in income tax expense from discontinued operations. Of the fiscal year 2015 amount, $0.1 million was recognized in income tax benefit from continuing operations and $0.1 million was recognized in income tax expense from discontinued operations. As of September 30, 2017 and September 30, 2016, we had approximately $0.3 million of interest and penalties accrued as tax liabilities on our balance sheet.

As of September 30, 2017, the Company had net operating loss carryforwards for U.S. federal income tax purposes of approximately $424.9 million which begin to expire in 2021. As of September 30, 2017, the Company had foreign net operating loss carryforwards of $2.3 million which begin to expire in 2021, as well as state net operating loss carryforwards of approximately $52.5 million which begin to expire in 2018. As of September 30, 2017, the Company also had tax credits (primarily foreign income and U.S. research and development tax credits) of approximately $3.2 million. The research credits will begin to expire in 2018. Utilization of net operating loss and tax credit carryforwards are subject to a substantial annual limitation due to the ownership change limitations set forth in Internal Revenue Code Section 382 and similar state provisions. The Company prepared an Internal Revenue Code 382 analysis to determine the annual limitations on the Company's consolidated net operating loss carryforwards. As a result of the $424.9 million of U.S. net operating loss carryforwards, approximately $226.5 million is subject to an annual limitation and $198.4 million of the net operating losses are not subject to an annual limitation. Such annual limitations could result in the expiration of the net operating loss and tax credit carryforwards before utilization.

The Company’s Board of Directors has adopted a Tax Benefits Preservation Plan (the “Rights Plan”) to help preserve the value of our net operating losses and tax credit carryforwards by reducing the risk of limitation of these deferred tax assets. The Rights Plan was approved by the Company’s shareholders on March 10, 2015. On September 26, 2017, the Company extended the final expiration date of the rights contained therein from October 3, 2107 to October 3, 2018 (subject to earlier expiration as described in the Rights Plan). The Company expects to submit the extension of the Rights Plan to shareholders for approval at the Company's 2018 annual meeting of shareholders. The Rights Plan is intended to reduce the likelihood that the Company will experience an ownership change for purposes of Internal Revenue Code Section 382 by discouraging any person or group from becoming a “5% shareholder” or increasing their ownership of the Company’s common stock if they are already a “5% shareholder.”

A reconciliation of the beginning and ending amount of unrecognized gross tax benefits is as follows:



Unrecognized Gross Tax Benefit (in thousands)
Balance as of September 30, 2015	$	413
Adjustments based on tax positions related to the current year	—
Adjustments based on tax positions of prior years	(125		)
Balance as of September 30, 2016	288
Adjustments based on tax positions related to the current year	131
Adjustments based on tax positions of prior years	—
Balance as of September 30, 2017	$	419

We believe that it is reasonably possible that all of the uncertain tax position will be paid or settled within the next 12 months. We file income tax returns in the U.S. federal, state, and local jurisdictions. In April 2015 the IRS completed its exam of the September 30, 2012 tax return and the Company was notified there were no changes to the originally filed return. There are no state income tax returns under examination. The following tax years remain open to assessment for each of the more significant jurisdictions where we are subject to income taxes: after fiscal year 2013 for the U.S. federal, after fiscal year 2012 for the State of New Mexico, and after fiscal year 2012 for the state of California.

Included in discontinued operations during the fiscal years ended September 30, 2016 and 2015 were $0.4 million and $0.2 million, respectively, of New Mexico incentive tax credits received. The amount received was allocated to cost of goods sold, selling, general and administrative and research and development expense primarily based on the number of employees allocated to the related departments. These credits resulted in cash refunds and a reduction of future payroll and compensation taxes. There was no incentive tax credit received during the fiscal year ended September 30, 2017.

Commitments and Contingencies

12 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Leases: Estimated future minimum lease payments under non-cancelable operating leases with an initial or remaining term of one year or more are $0.8 million, $0.8 million, $0.8 million, $0.6 million, and $1.3 million for the fiscal years ended September 30, 2018, 2019, 2020, 2021 and 2022 and thereafter, respectively.

Operating Lease Obligations: We lease certain facilities and equipment under non-cancelable operating leases. Operating lease amounts exclude renewal option periods, property taxes, insurance, and maintenance expenses on leased properties. Our facility leases typically provide for rental adjustments for increases in base rent (up to specific limits), property taxes, insurance, and general property maintenance that would be recorded as rent expense. Rent expense was $1.4 million, $1.4 million and $1.3 million for the fiscal years ended September 30, 2017, 2016 and 2015, respectively. There are no off-balance sheet arrangements other than our operating leases.

Asset Retirement Obligation: The Company recognizes its estimate of the fair value of its ARO in the period incurred in long-term liabilities. The fair value of the ARO is also capitalized as property, plant and equipment.

The fair value of our ARO was estimated by discounting projected cash flows over the estimated life of the related assets using credit adjusted risk-free rates which ranged from 1.20% to 4.20%. See the discussions below regarding ARO settlements during the fiscal years ended September 30, 2017 and 2016. There was no ARO settled during the fiscal year ended September 30, 2015. Accretion expense of $0.1 million was recorded during the fiscal years ended September 30, 2017, 2016 and 2015.

EMCORE leases its primary facility in Alhambra, California covering six buildings where manufacturing, research and development, and general and administrative work is performed. Several leases related to these facilities expired in 2011, and were being maintained on a month-to-month basis. In September 2017, a new lease for four of the six buildings was signed, which was effective on October 1, 2017. The new lease extends the terms of the lease for three years plus a three year option to extend the lease through September 2023. In connection with the lease agreement, the Company has recorded an ARO liability at September 30, 2017 and 2016 of $1.6 million and $1.5 million, respectively.

The Company’s ARO consists of legal requirements to return the existing leased facilities to their original state and certain environmental work to be performed due to the presence of a manufacturing fabrication operation and significant changes to the facilities over the past thirty years.

During the fiscal year ended September 30, 2017, in connection with the Company moving to a new manufacturing facility in China, the lease and related obligations, including ARO, at the former China facility was terminated, resulting in no payment by the Company. As a result of this agreement, the Company reduced its ARO associated with the former China facility by $45,000.

During the fiscal year ended September 30, 2016, the Company entered into an agreement to terminate the lease and related obligations, including ARO, in Newark, California for a one-time settlement payment of $0.2 million. As a result of this agreement and payment, the Company reduced its ARO associated with the Newark facility by $0.3 million.

In May 2016, which was retroactively effective on February 1, 2016, the Company entered into a five year lease agreement for facilities in Beijing, China where some manufacturing work is to be performed. In connection with the lease agreement, the Company has recorded an ARO liability in the amount of $50,000 and $48,000 at September 30, 2017 and 2016, respectively.

The following table summarizes ARO activity:



Asset Retirement Obligations	September 30,
(in thousands)	2017
Balance at September 30, 2016	$	1,618
Accretion expense	65
Revision in estimated cash flows	(45		)
Balance at September 30, 2017	$	1,638

Indemnifications: We have agreed to indemnify certain customers against claims of infringement of intellectual property rights of others in our sales contracts with these customers. Historically, we have not paid any claims under these indemnification obligations. In March 2012, we entered into a Master Purchase Agreement with SEI, pursuant to which we agreed to sell certain assets and transfer certain obligations. Under the terms of the Master Purchase Agreement, we agreed to indemnify SEI for up to $3.4 million of potential claims and expenses for the two-year period following the sale and we recorded this amount as a deferred gain on our balance sheet as a result of these contingencies.

On September 23, 2014, SEI filed for arbitration against EMCORE, in accordance with the terms of the Master Purchase Agreement between the parties. SEI was seeking $47.5 million from EMCORE, relating to numerous claims. On April 12, 2016, the International Court of Arbitration tribunal rejected SEI's claims. The panel ruled that EMCORE owed SEI none of the amounts SEI sought in the arbitration and that the Company was entitled to collect the $1.9 million held in escrow, which was received in June 2016. The Company was also entitled to recover $2.6 million in fees and costs from SEI, which was received in June 2016. During the fiscal year ended September 30, 2016, we recognized a gain associated with the release of $3.4 million of previously recorded gain associated with the sale of assets and reversal of other liabilities of $0.4 million, resulting in a credit of $3.8 million to recognition of previously deferred gain on sale of assets within discontinued operations of the Digital Products Business. During the fiscal year ended September 30, 2016, we recognized the $2.6 million recovery of previously incurred litigation fees and costs incurred by EMCORE within operating income as such represented the recovery of previously incurred legal expenses. See Note 4 - Discontinued Operations.

Legal Proceedings: We are subject to various legal proceedings, claims, and litigation, either asserted or unasserted, that arise in the ordinary course of business. While the outcome of these matters is currently not determinable, we do not expect the resolution of these matters to have a material adverse effect on our business, financial position, results of operations, or cash flows. However, the results of these matters cannot be predicted with certainty. Professional legal fees are expensed when incurred. We accrue for contingent losses when such losses are probable and reasonably estimable. In the event that estimates or assumptions prove to differ from actual results, adjustments are made in subsequent periods to reflect more current information. Should we fail to prevail in any legal matter or should several legal matters be resolved against the Company in the same reporting period, then the financial results of that particular reporting period could be materially affected.

a) Intellectual Property Lawsuits

We protect our proprietary technology by applying for patents where appropriate and, in other cases, by preserving the technology, related know-how and information as trade secrets. The success and competitive position of our product lines are impacted by our ability to obtain intellectual property protection for our research and development efforts. We have, from time to time, exchanged correspondence with third parties regarding the assertion of patent or other intellectual property rights in connection with certain of our products and processes.

b) Mirasol Class Action

On December 15, 2015, Plaintiff Christina Mirasol (“Mirasol”), on her own behalf and on behalf of a putative class of similarly situated individuals composed of current and former non-exempt employees of the Company working in California since December 15, 2011, filed a complaint against the Company in the Superior Court of California, Los Angeles County (the “Court”). The complaint alleged seven causes of action related to: (1) failure to pay overtime; (2) failure to provide meal periods; (3) failure to pay minimum wages; (4) failure to timely pay wages upon termination; (5) failure to provide compliant wage statements; (6) unfair competition under the California Business and Professions Code § 17200 et seq.; and (7) penalties under the Private Attorneys General Act. The claims were premised primarily on the allegation that Mirasol and the putative class members were not provided with their legally required meal periods. Mirasol sought recovery on her own behalf and on behalf of the putative class in an unspecified amount for compensatory and liquidated damages as well as for declaratory relief, injunctive relief, statutory penalties, pre-judgment interest, costs and attorneys’ fees.

In exchange for a one-time cash payment offered by the Company, certain current and former employees previously agreed to release the Company from all potential claims related to the matters alleged in the Mirasol lawsuit. The Company had recorded an accrual for these amounts at September 30, 2016 that was not material to the Company's results of operations, financial condition or cash flows, which had been recorded within Operating Expenses for the fiscal year ended September 30, 2016. On January 6, 2017, the Company and Mirasol agreed to a class action settlement of $0.3 million with regards to all outstanding claims. The parties have agreed to a formal settlement agreement, which was preliminarily approved by the Court, and will require final Court approval. As of September 30, 2017, the $0.3 million settlement remains outstanding. During the fiscal year ended September 30, 2017, the Company recorded an accrual of $0.2 million within Operating Expenses related to the settlement.

c) Mirasol Wrongful Termination Lawsuit

In August 2016, EMCORE was served with a second lawsuit by former employee Mirsaol, in the Superior Court of Los Angeles alleging that the Company violated California’s employment laws in terminating her employment in November 2015. By her complaint, Mirasol asserted five causes of action: (1) wrongful termination in violation of public policy; (2) discrimination on the basis of disability and/or medical condition; (3) failure to accommodate; (4) failure to engage in the interactive process; and (5) intentional infliction of emotional distress. On September 26, 2016, Mirasol dismissed the fifth cause of action for intentional infliction of emotional distress. Mirasol alleged that EMCORE wrongfully terminated her at the conclusion of a Family and Medical Act leave, without engaging in the interactive process of offering to provide her with reasonable accommodations. The plaintiff sought general, special, and punitive damages. On January 6, 2017, the Company and Mirasol agreed to a settlement of $50,000 with regards to all outstanding claims. This amount was paid as of September 30, 2017.

Equity

12 Months Ended

Sep. 30, 2017

Equity [Abstract]

Equity

Equity Plans

We provide long-term incentives to eligible officers, directors, and employees in the form of equity-based awards. We maintain three equity incentive compensation plans, collectively described below as our “Equity Plans”:


•	the 2000 Stock Option Plan,


•	the 2010 Equity Incentive Plan (“2010 Plan”), and


•	the 2012 Equity Incentive Plan (“2012 Plan”).

We issue new shares of common stock to satisfy awards issued under our Equity Plans.

The Board of Directors (the “Board”) of the Company previously approved, subject to stockholder approval, amendments to the 2012 Plan that would, among other changes, (1) increase the limit on the aggregate number of shares of common stock that may be delivered pursuant to awards granted under the 2012 Plan by 2,400,000 shares to a new aggregate share limit of 5,301,366 shares; (2) extend the ability to grant performance-based awards under the 2012 plan through the first annual meeting of shareholders that occurs in 2022; (3) extend the term of the 2012 Plan until March 17, 2027; (4) increase the annual limits on the number of different types of awards that may be granted to an individual under the 2012 Plan, so a participant may receive (a) a maximum of 200,000 stock options, 200,000 stock appreciation rights, 200,000 shares of restricted stock, 200,000 restricted stock units, 200,000 stock purchase rights and 200,000 share awards in any fiscal year of the Company, (b) in connection with their initial year of service, up to an additional 400,000 stock options, 400,000 stock appreciation rights, 400,000 shares of restricted stock, 400,000 restricted stock units, 400,000 stock purchase rights and 400,000 share awards, and (c) a maximum of $1,000,000 in cash earned in connection with the grant of performance units in any fiscal year; and (5) require all awards granted under the Amended 2012 Plan to have a minimum vesting period of one year and require that no award may vest earlier than the first anniversary of the grant date of the award, subject to limited exception. The Company’s stockholders approved the amendments to the 2012 Plan on March 17, 2017.

Stock Options

Most of our stock options vest and become exercisable over a four to five year period and have a contractual life of 10 years. Certain stock options awarded are intended to qualify as incentive stock options pursuant to Section 4