EMCORE (EMKR) 10-K 8 Dec 20 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Nov. 30, 2020	Mar. 31, 2020
Document And Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-36632
Entity Registrant Name	EMCORE Corporation
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	22-2746503
Entity Address, Address Line One	2015 W. Chestnut Street
Entity Address, City or Town	Alhambra
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91803
City Area Code	626
Local Phone Number	293-3400
Title of 12(b) Security	Common stock
Trading Symbol	EMKR
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 64.5
Entity Common Stock, Shares Outstanding		29,560,754
Entity Central Index Key	0000808326
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--09-30
Amendment Flag	false

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 110,128	$ 87,265	$ 85,617
Cost of revenue	74,546	72,176	67,130
Gross profit	35,582	15,089	18,487
Operating expense (income):
Selling, general, and administrative	24,631	32,080	21,377
Research and development	20,269	19,443	15,387
(Gain) loss on sale of assets	(2,284)	(302)	34
Total operating expense	42,616	51,221	36,798
Operating loss	(7,034)	(36,132)	(18,311)
Other income:
Interest (expense) income, net	(104)	629	733
Foreign exchange gain (loss)	198	(427)	(434)
Other income			110
Total other income	94	202	409
Loss before income taxes	(6,940)	(35,930)	(17,902)
Income tax (expense) benefit	(60)	(54)	449
Net loss	(7,000)	(35,984)	(17,453)
Foreign exchange translation adjustment	(32)	65	324
Comprehensive loss	$ (7,032)	$ (35,919)	$ (17,129)
Per share data:
Net loss per basic and diluted share (in dollars per share)	$ (0.24)	$ (1.29)	$ (0.64)
Weighted-average number of basic and diluted shares outstanding	29,136	27,983	27,266

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Current assets:
Cash and cash equivalents	$ 30,390	$ 21,574
Restricted cash	148	403
Accounts receivable, net of allowance of $227 and $148, respectively	25,324	18,497
Contract assets	1,566	1,055
Inventory	25,525	24,051
Prepaid expenses and other current assets	5,589	6,389
Assets held for sale	1,568
Total current assets	90,110	71,969
Property, plant, and equipment, net	21,052	37,223
Goodwill	69	69
Operating lease right-of-use assets	14,566
Other intangible assets, net	202	239
Other non-current assets	242	62
Total assets	126,241	109,562
Current liabilities:
Borrowings from credit facility		5,497
Accounts payable	16,484	10,701
Accrued expenses and other current liabilities	11,577	14,521
Operating lease liabilities - current	992
Total current liabilities	29,053	30,719
PPP liability - non-current	6,488
Operating lease liabilities - non-current	13,735
Asset retirement obligations	2,022	1,890
Other long-term liabilities	794	207
Total liabilities	52,092	32,816
Commitments and contingencies (Note 13)
Shareholders' equity:
Common stock, no par value, 50,000 shares authorized; 36,461 shares issued and 29,551 shares outstanding as of September 30, 2020; 35,803 shares issued and 28,893 shares outstanding as of September 30, 2019	744,361	739,926
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	918	950
Accumulated deficit	(623,409)	(616,409)
Total shareholders' equity	74,149	76,746
Total liabilities and shareholders' equity	$ 126,241	$ 109,562

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Accounts receivable:
Allowance for doubtful accounts	$ 227	$ 148
Shareholders' equity:
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000	50,000
Common stock, shares issued (in shares)	36,461	35,803
Common stock, shares outstanding (in shares)	29,551	28,893
Treasury stock, shares held (in shares)	6,910	6,910

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit	Total
Beginning balance (in shares) at Sep. 30, 2017	27,028,000
Common Stock, Number of Shares [Abstract]
Stock-based compensation (in shares)	372,000
Stock option exercises (in shares)	6,000
Issuance of common stock - ESPP (in shares)	171,000
Ending balance (in shares) at Sep. 30, 2018	27,577,000
Balance, beginning of period at Sep. 30, 2017	$ 730,906		$ 561	$ (562,972)
Common Stock, Number of Shares [Abstract]
Stock-based compensation	3,648
Stock option exercises	28
Tax withholding paid on behalf of employees for stock-based awards	(1,257)
Issuance of common stock - ESPP	741
Translation adjustment			324		$ 324
Net loss				(17,453)	(17,453)
Balance, end of period at Sep. 30, 2018	$ 734,066	$ (47,721)	885	(580,425)	$ 106,805
Common Stock, Number of Shares [Abstract]
Stock-based compensation (in shares)	307,000
Stock option exercises (in shares)	1,000
Issuance of common stock for acquisition (in shares)	811,000
Issuance of common stock - ESPP (in shares)	197,000
Ending balance (in shares) at Sep. 30, 2019	28,893,000				28,893,000
Common Stock, Number of Shares [Abstract]
Stock-based compensation	$ 2,607
Stock option exercises	1
Tax withholding paid on behalf of employees for stock-based awards	(203)
Issuance of common stock for acquisition	2,951
Issuance of common stock - ESPP	504
Translation adjustment			65		$ 65
Net loss				(35,984)	(35,984)
Balance, end of period at Sep. 30, 2019	$ 739,926	(47,721)	950	(616,409)	$ 76,746
Common Stock, Number of Shares [Abstract]
Stock-based compensation (in shares)	309,000
Stock option exercises (in shares)	1,000				650
Issuance of restricted stock units (shares)	116,000
Issuance of common stock - ESPP (in shares)	231,000
Ending balance (in shares) at Sep. 30, 2020	29,550,000				29,551,000
Common Stock, Number of Shares [Abstract]
Stock-based compensation	$ 3,517
Stock option exercises	2
Tax withholding paid on behalf of employees for stock-based awards	(111)
Issuance of restricted stock units	410
Issuance of common stock - ESPP	617
Translation adjustment			(32)		$ (32)
Net loss				(7,000)	(7,000)
Balance, end of period at Sep. 30, 2020	$ 744,361	$ (47,721)	$ 918	$ (623,409)	$ 74,149

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (7,000)	$ (35,984)	$ (17,453)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	5,484	7,142	5,617
Stock-based compensation expense	3,517	2,607	3,648
Provision adjustments related to doubtful accounts	188	62	599
Provision adjustments related to product warranty	373	186	431
Net (gain) loss on disposal of property, plant and equipment	(2,284)	(302)	34
Other	(342)	464	412
Total non-cash adjustments	6,936	10,159	10,741
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(7,518)	3,980	2,372
Inventory	(1,226)	6,486	5,067
Other assets	(13,465)	(238)	784
Accounts payable	6,171	(4,539)	477
Accrued expenses and other current liabilities	12,210	4,985	(518)
Total change in operating assets and liabilities	(3,828)	10,674	8,182
Net cash used in operating activities	(3,892)	(15,151)	1,470
Cash flows from investing activities:
Purchase of equipment	(4,516)	(10,790)	(6,583)
Acquisition of business, net of cash acquired		(21,483)
Proceeds from disposal of property, plant and equipment	15,403	470	82
Net cash provided by (used in) investing activities	10,887	(31,803)	(6,501)
Cash flows from financing activities:
Proceeds from PPP loan	6,488
Net (payments) proceeds from borrowings of credit facilities	(5,497)	5,497
Proceeds from exercise of equity awards	619	505	770
Taxes paid related to net share settlement of equity awards	(111)	(203)	(1,257)
Net cash provided by financing activities	1,499	5,799	(487)
Effect of exchange rate changes provided by foreign currency	67	(63)	(41)
Net increase (decrease) in cash, cash equivalents and restricted cash	8,561	(41,218)	(5,559)
Cash, cash equivalents and restricted cash at beginning of period	21,977	63,195	68,754
Cash, cash equivalents and restricted cash at end of period	30,538	21,977	63,195
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	113	126	63
Cash paid during the period for income taxes	63	68	131
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	(520)	$ (180)	$ 755
Restricted stock units issued in settlement of bonus	$ 410

Description of Business

Description of Business	12 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	NOTE 1. Business Overview EMCORE Corporation (referred to herein, together with its subsidiaries, 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 is a leading provider of sensors for navigation in the Aerospace and Defense market as well as a manufacturer of lasers and optical subsystems for use in the cable TV industry. 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 Mixed-Signal Optics We have two reporting segments, Aerospace and Defense, and Broadband. Aerospace and Defense is comprised of two product lines: (i) Navigation and Inertial Sensing, and (ii) Defense Optoelectronics. The Broadband segment is comprised of three product lines: (i) CATV Lasers and Transmitters, (ii) Chip Devices, and (iii) Other. Due to a shift in customer base, the previously existing Satellite/Microwave Communications product line has been renamed “Defense Optoelectronics.”

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 2. Principles of Consolidation The Company has a history of operating losses and negative cash flows from operations. The Company has taken a number of actions to continue to support its operations and meet its obligations, including headcount reductions and cost reductions. In addition, we generated additional liquidity through the monetization of certain fixed assets and real estate. On May 3, 2020, the Company entered into a Paycheck Protection Program Promissory Note and Agreement (the “PPP Loan Agreement”) with Wells Fargo Bank, N.A. under the Paycheck Protection Program (“PPP”) established under the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”) to receive loan proceeds of approximately $6.5 million (the “PPP Loan”), which the Company received on May 6, 2020. The Company believes that its existing liquidity will be sufficient to meet anticipated cash needs for at least the next 12 months from the issuance date of these financial statements. The consolidated financial statements included herein have been prepared on a going concern basis, which contemplates continuity of operations and the realization of assets and the repayment of liabilities in the ordinary course of business. Management evaluated the significance of the Company’s recent operating losses and determined that the Company’s current cash on hand, operating plan and sources of capital will be sufficient for the Company to continue as a going concern. Use of Estimates 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 Cash and Cash Equivalents Restricted Cash Accounts Receivable Inventory Note 8 - Inventory Property, Plant, and Equipment ​ ​ ​ ​ Description Estimated Useful Life Building ​ twenty years Equipment ​ three Furniture and fixtures ​ five years Computer hardware and software ​ five Leasehold improvements ​ three ​ 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 loss. Valuation of Long-lived Assets Property, Plant, and Equipment. Asset Retirement and Environmental Obligations Asset Retirement and Environmental Obligations We have known asset retirement conditions, such as certain asset decommissioning and restoration of rented facilities to be performed in the future. Business Combinations The Company uses the acquisition method of accounting for business combinations and recognizes assets acquired and liabilities assumed at their fair values on the date acquired. Goodwill represents the excess of the purchase price over the fair value of the net assets. The fair values of the assets and liabilities acquired are determined based upon the Company’s valuation using a combination of market, income or cost approaches. In certain circumstances, the allocations of the purchase price are based upon preliminary estimates and assumptions and subject to revision when we receive final information, including appraisals and other analysis. Accordingly, the measurement period for such purchase price allocations will end when the information, or the facts and circumstances, becomes available, but will not exceed twelve months. We will recognize measurement-period adjustments during the period of resolution, including the effect on earnings of any amounts that would have been recorded in previous periods if the accounting had been completed at the acquisition date. Fair Value of Financial Instruments Fair Value Measurements and Disclosures. Revenue Recognition To determine the proper revenue recognition, we perform the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) we satisfy a performance obligation. We only apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer. The vast majority of our revenues are from product sales to our customers, pursuant to purchase orders with short lead times. Revenues from product sales are recognized when the customer obtains control of our product, which occurs at a point in time. The Company has elected to account for shipping and handling activities as a fulfillment cost as permitted by the standard. When we perform shipping and handling activities after the transfer of control to the customer (e.g. when control transfers prior to delivery), they are considered fulfillment activities, and accordingly, the costs are accrued when the related revenue is recognized. We expense incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that we would have recognized is one year or less. In certain instances, inventory is maintained by our customers at consigned locations. Revenues from consigned sales are recognized when the customer obtains control of our product, which occurs at a point in time. This is typically when the customer pulls product for use. We use a number of wholesale distributors around the world and recognize revenue when the wholesale distributor obtains control of our product, which occurs at a point in time, typically upon shipment. Our wholesale distributors are contractually obligated to pay us on standard commercial terms, consistent with our end-use customers. We do not sell to wholesale distributors on consignment and do not give wholesale distributors a right of return. In certain instances, prior to 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 (e.g. customer acceptance clause). 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. Revenues are recognized when the customer obtains control of the qualified product, which occurs at a point in time, typically upon shipment. To a lesser extent, we enter into other types of contracts including non-recurring engineering contracts. We recognize revenue for these arrangements over time or at a point in time depending on our evaluation of when the customer obtains control of the promised goods or services. For contracts that include multiple performance obligations, we allocate revenue to each performance obligation based on estimates of the relative standalone selling price that we would charge the customer for each promised product or service. Revenue from products and services transferred to customers over time accounted for 5%, 4%, and 1% of the Company’s revenue for the years ended September 30, 2020, 2019, and 2018, respectively. Receivables, Net - Remaining Performance Obligations - twelve months Product Warranty Reserves Contingencies Disaggregation of Revenue - Note 15 – Segment Data and Related Information Revenue is also classified by major product category and is presented below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Fiscal Years ended September 30, ​ ​ ​ ​ ​ % of ​ ​ ​ ​ % of ​ ​ ​ % of (in thousands) 2020 Revenue 2019 Revenue 2018 Revenue ​ Navigation and Inertial Sensing ​ $ 38,983 ​ 35 % $ 23,203 ​ 27 % $ 7,149 ​ 8 % Defense Optoelectronics ​ ​ 16,257 ​ 15 ​ ​ 9,883 ​ 11 ​ ​ 6,418 ​ 8 ​ CATV Lasers and Transmitters ​ ​ 44,457 ​ 40 ​ ​ 41,150 ​ 47 ​ ​ 62,000 ​ 72 ​ Chip Devices ​ 4,873 ​ 5 ​ ​ 10,828 ​ 12 ​ ​ 10,050 ​ 12 ​ Other ​ 5,558 ​ 5 ​ ​ 2,201 ​ 3 ​ ​ — ​ — ​ Total revenue ​ $ 110,128 100 % $ 87,265 100 % $ 85,617 100 % ​ ​ Leases In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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. The new standard was effective for our fiscal year beginning October 1, 2019. We adopted Topic 842 using the modified retrospective approach. The modified retrospective approach provides a method for recording existing leases at the beginning of the period of adoption. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which, among other things, allowed us to carry forward the historical lease classification and we elected the hindsight practical expedient to determine the lease term for existing leases. Additionally, the Company elected an accounting policy to not record operating lease right-of-use (“ROU”) assets and lease liabilities for leases with an initial term of twelve months or less on its consolidated balance sheet. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Adoption of the new standard resulted in the recording of net operating lease ROU assets of $4.8 million and operating lease liabilities of $4.8 million as of October 1, 2019. The standard did not have an impact on our consolidated results of operations or cash flow. The impact of the adoption of ASC 842 on the balance sheet as of October 1, 2019 was: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As Reported ​ ​ ​ ​ ​ Balance ​ ​ ​ September 30, 2019 ​ ​ Increase ​ ​ October 1, 2019 ( in thousands ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease right-of-use assets ​ $ - ​ $ 4,800 ​ $ 4,800 Total assets ​ ​ 109,562 ​ ​ 4,800 ​ ​ 114,362 Operating lease liabilities ​ ​ - ​ ​ 800 ​ ​ 800 Total current liabilities ​ ​ 30,719 ​ ​ 800 ​ ​ 31,519 Operating lease liabilities non-current ​ ​ - ​ ​ 4,000 ​ ​ 4,000 Total liabilities ​ ​ 32,816 ​ ​ 4,800 ​ ​ 37,616 Total liabilities and equity ​ ​ 109,562 ​ ​ 4,800 ​ ​ 114,362 ​ In connection with the sale/leaseback of non-residential real estate on February 10, 2020, the Company recorded an additional operating ROU assets Note 9 – Property, Plant and Equipment, net The Company determines if an arrangement is a lease at its inception. ROU assets and operating lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The Company uses its estimated incremental borrowing rate in determining the present value of lease payments considering the term of the lease, which is derived from information available at the lease commencement date. The lease term includes renewal options when it is reasonably certain that the option will be exercised, and excludes termination options. To the extent that the Company’s agreements have variable lease payments, the Company includes variable lease payments that depend on an index or a rate and excludes those that depend on facts or circumstances occurring after the commencement date, other than the passage of time. Lease expense for these leases is recognized on a straight-line basis over the lease term. The Company has elected not to recognize ROU assets and lease liabilities that arise from short-term (12 months or less) leases for any class of underlying asset. Operating leases are included in operating lease ROU assets, current operating lease liabilities, and non-current operating lease liabilities in the Company's consolidated balance sheet. The Company’s lease arrangements consist primarily of corporate, manufacturing and other facility agreements as well as various office equipment agreements. The leases expire at various dates through 2035, some of which include options to extend the lease term. The options with the longest potential total lease term consist of options for extension of up to five years following expiration of the original lease term. During the fiscal year ended September 30, 2020, the Company recorded $1.8 million of operating lease expense. During the fiscal years ended September 30, 2019 and 2018, the Company recorded $1.3 million and $1.2 million of rent expense, respectively. The Company's finance leases and short-term leases are immaterial. Supplemental cash information and non-cash activities related to operating leases are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ For the Fiscal Year Ended ​ September 30, 2020 Operating cash outflows from operating leases ​ $ 1,592 Operating lease assets obtained in exchange for new lease liabilities ​ $ 10,791 ​ Maturities of operating lease liabilities as of September 30, 2020 were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ Amount ​ 2021 ​ $ 1,792 ​ 2022 ​ ​ 1,806 ​ 2023 ​ ​ 1,857 ​ 2024 ​ ​ 1,686 ​ 2025 ​ ​ 1,730 ​ Thereafter ​ ​ 12,366 ​ Total lease payments ​ ​ 21,237 ​ Less imputed interest ​ ​ (6,510) ​ Total ​ $ 14,727 ​ ​ The following is a schedule of future minimum operating lease payments as of September 30, 2019 (in thousands): ​ ​ ​ ​ ​ ​ Amount 2020 ​ $ 988 2021 ​ ​ 839 2022 ​ ​ 824 2023 ​ ​ 853 2024 ​ ​ 655 Thereafter ​ ​ 1,350 Total lease payments ​ $ 5,509 ​ Weighted-average remaining lease term and discount rate related to operating leases are as follows: ​ ​ ​ ​ ​ ​ ​ September 30, 2020 Weighted average remaining lease term (years) ​ 14.4 ​ Weighted average discount rate ​ 6.1 % ​

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	NOTE 3. (a) Recent Accounting Standards or Updates Not Yet Effective ● In June 2016, the FASB issued ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which changes the way entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net earnings. The new standard is effective for annual periods beginning after December 15, 2019, including interim periods within those annual periods. The new standard will be effective for our fiscal year beginning October 1, 2020 and early adoption is permitted. The Company does not expect the adoption of this new guidance to have a significant impact on its consolidated financial statements and related disclosures.

Acquisition

Acquisition	12 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Acquisition	NOTE 4. On June 7, 2019, we completed the acquisition of SDI, a private-equity backed navigation systems provider with a scalable, chip-based platform for higher volume gyro applications utilizing Quartz MEMS technology. The total purchase price was approximately $25.0 million, consisting of (i) approximately $22.0 million in cash after working capital adjustments and (ii) the issuance of approximately 811 thousand shares of common stock with an aggregate value of approximately $3.0 million as of the closing date. Following the closing, we began integrating SDI into our current Navigation and Inertial Sensing product line and have included the financial results of SDI in our consolidated financial statements beginning on the acquisition date. Net revenue and net loss of SDI from the acquisition date of $9.8 million and $0.6 million, respectively, was included in our consolidated statements of operations and comprehensive loss for the fiscal year ended September 30, 2019. Purchase Price Allocation The total purchase price was allocated to the assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date. The Company finalized the allocation of the purchase price in the fiscal year ended September 30, 2020, which resulted in no change from the preliminary purchase price recorded at September 30, 2019. The table below represents the purchase price allocation to the assets acquired and liabilities assumed of SDI based on their estimated fair values as of the acquisition date. The fair values assigned to assets acquired and liabilities assumed are based on management’s best estimates and assumptions at the acquisition date. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average Useful (in thousands) ​ Amount ​ Life (years) Purchase price ​ $ 24,978 ​ Developed technology ​ 250 7 Cash acquired ​ ​ 541 Inventories ​ 8,522 Accounts receivable ​ 4,291 Other assets ​ 355 Land and building ​ 12,890 Equipment ​ 2,913 Net liabilities assumed ​ (4,853) Goodwill ​ $ 69 ​ Identifiable intangible assets Tangible assets acquired: Inventories Finished goods were valued at estimated selling price less costs of disposal and a reasonable profit allowance for the selling effort. Raw materials were valued at estimated replacement cost. Property, plant and equipment The property, plant and equipment acquired were valued using either the replacement cost or market approach, as appropriate, as of the acquisition date. Goodwill Goodwill represents the excess of the preliminary purchase price over the fair value of the assets acquired and liabilities assumed. The goodwill recognized is primarily attributable to the benefits the Company expects to derive from deepening the Company’s expertise in navigation systems products. For the fiscal year ended September 30, 2019, the Company incurred transaction costs of approximately $0.8 million in connection with the SDI acquisition, which were expensed as incurred and included in selling, general and administrative expenses within the consolidated statements of operations. Unaudited Pro Forma Financial Information The following unaudited pro forma financial information presented for the fiscal years ended September 30, 2019 and 2018 does not purport to be indicative of the results of operations that would have been achieved had the acquisition of SDI been consummated on October 1, 2017, nor of the results which may occur in the future. The pro forma amounts are based upon available information and certain assumptions that the Company believes are reasonable. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Fiscal Years ended ​ ​ September 30, ( in thousands, except per share data 2019 2018 Revenue ​ $ 107,199 ​ $ 113,398 Net loss ​ $ (42,013) ​ $ (18,136) Net loss per basic and diluted share ​ $ (1.50) ​ $ (0.67) Weighted-average number of basic and diluted shares outstanding ​ 27,983 ​ 27,266 ​

Cash, Cash Equivalents and Rest

Cash, Cash Equivalents and Restricted Cash	12 Months Ended
	Sep. 30, 2020
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	NOTE 5. 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 consolidated statements of cash flows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 2018 Cash ​ $ 11,325 ​ $ 4,338 ​ $ 2,965 Cash equivalents ​ ​ 19,065 ​ ​ 17,236 ​ ​ 60,152 Restricted cash ​ 148 ​ 403 ​ 78 Total cash, cash equivalents and restricted cash ​ $ 30,538 ​ 21,977 ​ 63,195 ​ 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, 2020, 2019 and 2018.

Fair Value Accounting

Fair Value Accounting	12 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Accounting	NOTE 6. ASC Topic 820 (“ASC 820”), Fair Value Measurements, ● 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. Cash, cash equivalents and restricted cash are based on Level 1 measurements. 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. See Note 4 Acquisition

Accounts Receivable

Accounts Receivable	12 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Accounts Receivable	NOTE 7. The components of accounts receivable consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Accounts receivable, gross ​ $ 25,551 ​ $ 18,645 Allowance for doubtful accounts ​ (227) ​ (148) Accounts receivable, net ​ $ 25,324 ​ $ 18,497 ​ 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, 2020, 2019 and 2018. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for Doubtful Accounts ​ For the Fiscal Years ended September 30, (in thousands) ​ 2020 2019 ​ 2018 Balance at beginning of period ​ $ 148 ​ $ 548 ​ $ 22 Provision adjustment - expense, net of recoveries ​ 188 ​ 62 ​ 599 Write-offs and other adjustments - deductions to receivable balances ​ (109) ​ (462) ​ (73) Balance at end of period ​ $ 227 ​ $ 148 ​ $ 548 ​

Inventory

Inventory	12 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventory	NOTE 8. The components of inventory consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Raw materials ​ $ 13,354 ​ $ 11,510 Work in-process ​ 8,381 ​ 8,176 Finished goods ​ 3,790 ​ 4,365 Inventory balance at end of period ​ $ 25,525 ​ $ 24,051 ​

Property, Plant, and Equipment,

Property, Plant, and Equipment, net	12 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment, net	NOTE 9. The components of property, plant, and equipment, net consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Land ​ $ — ​ $ 3,484 Building ​ — ​ 9,405 Equipment ​ 35,218 ​ 42,308 Furniture and fixtures ​ 1,125 ​ 1,109 Computer hardware and software ​ 3,473 ​ 3,554 Leasehold improvements ​ 3,169 ​ 2,676 Construction in progress ​ 10,301 ​ 9,330 Property, plant, and equipment, gross ​ $ 53,286 ​ $ 71,866 Accumulated depreciation ​ (32,234) ​ (34,643) Property, plant, and equipment, net ​ $ 21,052 ​ $ 37,223 ​ Depreciation expense totaled $5.5 million, $7.1 million and $5.6 million during the fiscal years ended September 30, 2020, 2019 and 2018, respectively. During the fiscal year ended September 30, 2020, the Company sold certain equipment and recognized a gain on sale of assets of approximately $2.0 million. In addition, the Company entered into agreements to sell additional equipment and these assets have been reclassified to assets held for sale. On February 10, 2020, SDI completed a sale and leaseback transaction with Eagle Rock Holdings LP (“Buyer”) of non-residential real estate (the “Sale and Leaseback Transaction”). Under the terms of the applicable purchase agreement, SDI sold its property located in Concord, California (the “Concord Real Property”) to Buyer for a total purchase price of $13.2 million. The Company received net proceeds of $12.8 million after reducing for transaction commissions and expenses incurred in connection with the sale. The Company recorded a gain on the sale of assets of approximately $0.3 million in the fiscal year ended September 30, 2020 related to this transaction. At the consummation of the Sale and Leaseback Transaction, SDI entered into a Single-Tenant Triple Net Lease (the “Lease Agreement”) with Buyer pursuant to which SDI leased back from Buyer the Concord Real Property for a term commencing on the consummation of the Sale and Leaseback Transaction and ending fifteen As a result of the Lease Agreement, the Company recorded net operating lease ROU assets

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Sep. 30, 2020
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	NOTE 10. The components of accrued expenses and other current liabilities consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Compensation ​ $ 6,916 ​ $ 5,185 Warranty ​ 803 ​ 654 Legal expenses and other professional fees ​ ​ 211 ​ ​ 4,407 Contract liabilities ​ ​ 502 ​ ​ 541 Income and other taxes ​ 1,265 ​ 1,135 Severance and restructuring accruals ​ 17 ​ 172 Other ​ 1,863 ​ 2,427 Accrued expenses and other current liabilities ​ $ 11,577 ​ $ 14,521 ​ Warranty: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Product Warranty Accruals ​ For the fiscal year ended September 30, (in thousands) 2020 2019 2018 Balance at beginning of period ​ $ 654 ​ $ 642 ​ $ 684 Provision for product warranty - expense ​ 626 ​ 186 ​ 431 Warranty liability assumed in acquisition liability ​ — ​ 80 ​ — Adjustments and utilization of warranty accrual ​ (477) ​ (254) ​ (473) Balance at end of period ​ $ 803 ​ $ 654 ​ $ 642 ​ Severance and restructuring accruals Our severance and restructuring-related accruals specifically relate to the reductions in force. Expense related to severance and restructuring accruals is included in selling, general, and administrative expense on our consolidated statements of operations and comprehensive (loss) income. The following table summarizes the changes in the severance and restructuring accrual account: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Severance- Restructuring ​ ​ (in thousands) ​ related accruals ​ related accruals ​ Total Balance as of September 30, 2019 $ 172 $ — $ 172 Expense - charged to accrual ​ 626 ​ — ​ 626 Payments and accrual adjustments ​ (781) ​ — ​ (781) Balance as of September 30, 2020 ​ $ 17 ​ $ — ​ $ 17 ​

Credit Facilities and Debt

Credit Facilities and Debt	12 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Credit Facilities and Debt	NOTE 11. Credit Facilities On November 11, 2010, we entered into a Credit and Security Agreement (as amended to date, 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. The Credit Facility matures in November 2021 and currently provides us with a revolving credit line of up to $15.0 million at an interest rate equal to LIBOR plus 1.75%, subject to a borrowing base formula, that can be used for working capital requirements, letters of credit, acquisitions, and other general corporate purpose subject to a requirement, for certain specific uses, that the Company have liquidity of at least $25.0 million after such use. The Credit Facility requires us to maintain (a) liquidity of at least $10.0 million and (b) excess availability of at least $1.0 million. As of September 30, 2020, there were no amounts outstanding under this Credit Facility and the Company was in compliance with all financial covenants. Also, as of September 30, 2020, the Credit Facility had approximately $0.5 million reserved for one outstanding stand-by letter of credit and approximately $7.9 million available for borrowing. As of November 30, 2020, there was no outstanding balance under this Credit Facility, approximately $0.5 million reserved for one outstanding stand-by letter of credit and approximately $9.7 million available for borrowing. Debt On May 3, 2020, the Company entered into a Paycheck Protection Program Promissory Note and Agreement (the “PPP Loan Agreement”) with Wells Fargo Bank, N.A. under the Paycheck Protection Program (“PPP”) established under the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”) to receive loan proceeds of approximately $6.5 million (the “PPP Loan”), which the Company received on May 6, 2020. The PPP Loan matures on May 3, 2022 and bears interest at a fixed rate of 1.00% per annum, payable monthly. Monthly payments in the amount of $273,160 will be due and payable beginning at such time as is in accordance with the terms of the Paycheck Protection Flexibility Act of 2020 and continuing each month thereafter until maturity of the PPP Loan. There is no prepayment penalty. Under the terms of the PPP, all or a portion of the principal may be forgiven if the PPP Loan proceeds are used for qualifying expenses as described in the CARES Act, such as payroll costs, benefits, rent, and utilities. No assurance is provided that the Company will obtain forgiveness of the PPP Loan in whole or in part. With respect to any portion of the PPP Loan that is not forgiven, the PPP Loan will be subject to customary provisions for a loan of this type, including customary events of default relating to, among other things, payment defaults and breaches of the provisions of the PPP Loan Agreement. The Company expects to apply for forgiveness of the PPP loan during the fiscal year ending September 30, 2021.

Income and Other Taxes

Income and Other Taxes	12 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income and Other Taxes	NOTE 12. The Company’s loss from operations before income taxes consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss before income taxes ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 Domestic ​ $ (7,159) ​ $ (35,100) ​ $ (16,752) Foreign ​ 219 ​ (830) ​ (1,150) Loss before income taxes ​ $ (6,940) ​ $ (35,930) ​ $ (17,902) ​ The Company’s income tax expense (benefit) consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income tax (benefit) expense ​ For the Fiscal Years Ended September 30, (in thousands) 2020 2019 2018 Federal: ​ ​ ​ Current ​ $ 30 ​ $ — ​ $ (502) Deferred ​ (43) ​ — ​ — ​ ​ (13) ​ — ​ (502) State: ​ ​ ​ Current ​ 98 ​ 54 ​ 53 Deferred ​ (25) ​ — ​ — ​ ​ 73 ​ 54 ​ 53 Foreign: ​ ​ ​ Current ​ — ​ — ​ — Deferred ​ — ​ — ​ — ​ ​ ​ — ​ ​ — ​ ​ — Total income tax expense (benefit) ​ $ 60 ​ $ 54 ​ $ (449) ​ 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) 2020 2019 2018 Income tax benefit computed at U.S. federal statutory rate ​ $ (1,457) ​ $ (7,540) ​ $ (4,346) ​ State tax benefit, net of U.S. federal effect ​ (156) ​ (906) ​ (168) ​ Foreign tax rate differential ​ 13 ​ (28) ​ 36 ​ Effect due to change in tax rate ​ (137) ​ (183) ​ 57,988 ​ Shortfall from stock based compensation ​ 432 ​ 248 ​ 681 ​ Other ​ 94 ​ 223 ​ 216 ​ State net operating loss carryforward adjustment ​ 533 ​ 139 ​ (305) ​ Change in valuation allowance ​ 738 ​ 8,101 ​ (54,551) ​ Income tax expense (benefit) ​ $ 60 ​ $ 54 ​ $ (449) ​ Effective tax rate ​ 1.0 % 0.2 % (2.5) % ​ Significant components of our deferred tax assets are as follows: ​ ​ ​ ​ ​ ​ ​ Deferred Tax Assets As of September 30 (in thousands) 2020 2019 Deferred tax assets: ​ ​ ​ Federal net operating loss carryforwards ​ $ 100,363 ​ $ 99,298 Foreign net operating loss carryforwards ​ 1,680 ​ 1,271 Income tax credit carryforwards ​ 2,671 ​ 2,671 Inventory reserves ​ 2,320 ​ 3,535 Accounts receivable reserves ​ 55 ​ 50 Accrued warranty reserve ​ 193 ​ 153 State net operating loss carryforwards ​ 5,970 ​ 6,174 Stock compensation ​ 806 ​ 704 Deferred compensation ​ 443 ​ 404 Fixed assets and intangibles ​ (348) ​ (2,693) ROU lease liability ​ ​ 3,529 ​ ​ — ROU lease assets ​ ​ (3,467) ​ ​ — Other ​ 1,322 ​ 2,255 Total deferred tax assets ​ 115,537 ​ 113,822 Valuation allowance ​ (115,537) ​ (113,891) Net deferred tax liabilities ​ $ — ​ $ (69) ​ For the fiscal years ended September 30, 2020, 2019 and 2018, the Company recorded income tax (expense) benefit of approximately $(0.1) million, $(0.1) million and $0.4 million, respectively. Income tax expense for the fiscal year ended September 30, 2020 is comprised primarily of state minimum tax expense partially offset by the reversal of a deferred tax liability related to the Concord Real Property. Income tax expense for the fiscal year ended September 30, 2019 is primarily comprised of state minimum tax expense. Income tax benefit for the fiscal year ended September 30, 2018 is primarily comprised of the effect of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) which eliminated Alternative Minimum Taxes (“AMT”) and resulted in a refund to the Company of amounts paid in prior fiscal years, state minimum taxes, and foreign tax expense. For the fiscal years ended September 30, 2020, 2019 and 2018, the effective tax rate on operations was 1.0%, 0.2% and (2.5)%, respectively. The lower tax rate for the fiscal years ended September 30, 2020 and 2019 are primarily due to the operating loss and state minimum tax expense. The higher beneficial tax rate for the fiscal year ended September 30, 2018 was primarily due to the effect of the Tax Act, which resulted in a credit to the Company on future tax payments for past AMT amounts paid and the current period operating loss. The Company uses some estimates to forecast permanent differences between book and tax accounting. We have not provided for income taxes on non-U.S. subsidiaries’ undistributed earnings as of September 30, 2020 because we plan to indefinitely reinvest the unremitted earnings of our non-U.S. subsidiaries and all of our non-U.S. subsidiaries historically have negative earnings and profits. All deferred tax assets have a full valuation allowance at September 30, 2020. However, on a quarterly basis, the Company will evaluate the positive and negative evidence to assess whether the more likely than not criteria, has been satisfied in determining whether there will be further adjustments to the valuation allowance. During the fiscal years ended September 30, 2020 and 2019, there were no material increases or decreases in unrecognized tax benefits. As of September 30, 2020, the Company had net operating loss carryforwards for U.S. federal income tax purposes of approximately $477.9 million which begin to expire in 2022. As of September 30, 2020, the Company had foreign net operating loss carryforwards of $6.7 million which begin to expire in 2021, as well as state net operating loss carryforwards of approximately $68.5 million which begin to expire in 2021. As of September 30, 2020, the Company also had tax credits (primarily foreign income and U.S. research and development tax credits) of approximately $2.7 million. The research credits will begin to expire in 2021. 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 $477.9 million of U.S. net operating loss carryforwards, approximately $236.1 million is subject to an annual limitation and $241.8 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. 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, 2018 ​ $ 419 Adjustments based on tax positions related to the current year ​ — Adjustments based on tax positions of prior years ​ — Balance as of September 30, 2019 ​ 419 Adjustments based on tax positions related to the current year ​ — Adjustments based on tax positions of prior years ​ — Balance as of September 30, 2020 ​ $ 419 ​ As of September 30, 2020 and 2019, we had approximately $0.6 million and $0.5 million, respectively, of interest and penalties accrued as tax liabilities on our balance sheet. We believe that it is reasonably possible that none of the uncertain tax positions will be paid or settled within the next 12 months. Interest that is accrued on tax liabilities is recorded within interest expense on the consolidated statements of operations.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 13. Leases Operating Lease Obligations computation of rent expense where such options are likely to be exercised due to significant economic incentive. Rent expense was approximately $1.9 million, $1.3 million and $1.2 million for the fiscal years ended September 30, 2020, 2019 and 2018, respectively. There are no off-balance sheet arrangements other than our operating leases. Asset Retirement Obligation In future periods, the ARO is accreted for the change in its present value and capitalized costs are depreciated over the useful life of the related assets. If the fair value of the estimated ARO changes, an adjustment will be recorded to both the ARO and the asset retirement capitalized cost. Revisions in estimated liabilities can result from revisions of estimated inflation rates, changes in estimated retirement costs, and changes in the estimated timing of settling the ARO. 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%. Accretion expense of $32,000, $0.1 million and $0.1 million was recorded during the fiscal years ended September 30, 2020, 2019 and 2018, respectively. EMCORE leases its primary facility in Alhambra, California covering five buildings where manufacturing, research and development, and general and administrative work is performed . 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. The following table summarizes ARO activity: ​ ​ ​ ​ ​ Asset Retirement Obligations ​ September 30, (in thousands) 2020 Balance at September 30, 2019 ​ $ 1,890 Accretion expense 32 Revision in estimated cash flows 100 Balance at September 30, 2020 ​ $ 2,022 ​ 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 customer indemnification obligations. We enter into indemnification agreements with each of our directors and executive officers pursuant to which we agree to indemnify them for certain potential expenses and liabilities arising from their status as a director or executive officer of the Company. We maintain director and officer insurance, which may cover certain liabilities arising from our obligation to indemnify our directors and executive officers in certain circumstances. It is not possible to determine the aggregate maximum potential loss under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular claim. Legal Proceedings outcome of legal proceedings involves judgments, estimates and inherent uncertainties and 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) Phoenix Navigation Components, LLC (“Phoenix”) Legal Proceedings On June 12, 2018, Phoenix commenced an arbitration against EMCORE with the American Arbitration Association (“AAA”) in New York. On August 31, 2018, Phoenix filed a First Amended Demand for Arbitration, asserting the following claims: breach of contract, breach of the covenant of good faith and fair dealing, misappropriation of trade secrets (under the Defend Trade Secrets Act, 18 U.S.C. § 1836, and New York law), conversion, unjust enrichment, correction of inventorship relating to U.S. Patent No. 8,773,665, and declaratory relief, relating to EMCORE’s termination of certain agreements entered into between EMCORE and Phoenix related to the purported license of certain intellectual property related to fiber optic gyroscope technology and disputed royalty payments related thereto. On September 14, 2018, EMCORE filed an Answering Statement and Counterclaim, denying all of Phoenix’s claims and asserting counterclaims for breach of the implied covenant of good faith and fair dealing and declaratory relief. On June 21, 2019, an interim award (the “Interim Award”) was issued in connection with all claims in the AAA proceeding other than the claims related to correction of inventorship and declaratory relief relating to U.S. Patent No. 8,773,665 (the “Patent Claims”). While Phoenix ultimately sought $21.2 million in total damages, plus attorneys’ fees and costs, in the Interim Award, the arbitrator found in the Interim Award that (i) Phoenix’s claim for breach of the covenant of good faith and fair dealing was denied; (ii) Phoenix’s claim for breach of the agreements entered with EMCORE for failure to provide funding for non-recurring engineering was denied; (iii) Phoenix’s claim for unjust enrichment was denied; (iv) Phoenix’s claim for conversion was granted, but damages for that claim duplicate the damages on the breach of contract and misappropriation of trade secret claims described below and no incremental damages were awarded based on the granting of this claim; and (v) EMCORE’s request for a declaration that, as between EMCORE and Phoenix, EMCORE owns its proprietary IOC and transceiver was granted. The arbitrator also found in the Interim Award that (i) EMCORE breached certain license agreements entered into with Phoenix by failing to make royalty payments due and failing to provide required accountings, (ii) Phoenix and its members are no longer subject to prior exclusivity restrictions; (iii) EMCORE’s claim for breach of the covenant of good faith and fair dealing was denied; and (iv) the proceedings for the Patent Claims and EMCORE’s counterclaim with respect thereto would be established by a future proceeding. Further, out of the original 97 trade secret subpart claims by Phoenix, the arbitrator found in the Interim Award that EMCORE had misappropriated a total of five trade secret subparts (the “Deemed Trade Secrets”), and found that at least one Deemed Trade Secret was being used in seven EMCORE products (the “EMCORE Products”). The arbitrator found that as a result of the foregoing, royalties of 7.5% of the sale price are owed, to the extent not previously paid, on (i) sales through July 16, 2018 on all fiber optic gyroscopes sold by EMCORE, and (ii) sales from July 16, 2018 through May 31, 2019 of the EMCORE Products whether standalone or incorporated into a larger product, in each case together with interest at the New York statutory rate of 9% simple interest. In addition, the arbitrator found in the Interim Award that Phoenix was the prevailing party, and Phoenix was awarded attorneys’ fees and costs in the amount of approximately $3.7 million, which amount was reduced 10% from Phoenix’s attorneys’ fees request. In the Interim Award, the arbitrator further determined that EMCORE shall pay Phoenix a royalty of 7.5% of the sale price on (i) future customer payments for certain EMCORE product contracts previously entered into and (ii) customer payments for future sales of any product using any Deemed Trade Secret, in each case payable in a single lump sum within one month of completion of the calendar quarter in which payment has been received from the customer, and shall concurrently submit to Phoenix a written report that sets forth the calculation of the amount of the royalty payment in a form similar to previous royalty reports, provided that following the first $1 million of royalty payments on the EMP-1 product only, inclusive of payments made to date, EMCORE will pay to Phoenix a royalty of 2.25% of the sale price (net of any warranty work, returns, rebates, discounts or credits). EMCORE is required to continue to make royalty payments in this manner until such time as it has in good faith determined, and can so document, that it has completely ceased use of the Deemed Trade Secrets, and at such time, EMCORE shall provide Phoenix written notice of same. On October 1, 2019, the arbitrator issued a Modified Partial Final Award, which incorporated by reference the terms of the Interim Award and ordered and awarded, among other items, (i) an award to Phoenix of attorneys’ fees and costs in the amount of approximately $3.8 million, (ii) an award to Phoenix of $1.0 million in damages owing for unpaid royalties through June 30, 2019, of which $0.6 million remained to be paid as of the issuance of the Modified Partial Final Award, (iii) an award to Phoenix of $0.1 million in pre-judgment interest, calculated at the New York statutory rate of 9% simple interest, and (iv) an order that EMCORE make the payments in the foregoing items (i), (ii) and (iii) on or before October 14, 2019. On October 10, 2019, EMCORE made the foregoing payments to Phoenix in an aggregate amount equal to approximately $4.5 million. This amount was accrued as of September 30, 2019 and paid during the fiscal year ended September 30, 2020. During the fiscal year ended September 30, 2019, we recorded the award and settlement to Phoenix of attorneys’ fees and costs in the amount of approximately $3.8 million, and our legal expenses of approximately $5.7 million within selling, general and administrative expense on the consolidated statement of operations and comprehensive (loss) income. The Patent Claims were not determined in the Interim Award or the Modified Partial Final Award. In December 2019, EMCORE and Phoenix entered into a settlement agreement with respect to the Patent Claims pursuant to which EMCORE (i) granted Phoenix a fully paid, perpetual nonexclusive license to the disputed patent and (ii) agreed to pay Phoenix a total of $0.4 million, of which $0.2 million was paid in January 2020, $0.1 million was paid in April 2020 and $0.1 million was paid in July 2020. During the fiscal year ended September 30, 2020, we recorded the settlement of the Patent Claims in the amount of approximately $0.4 million within selling, general and administrative expense on the consolidated statement of operations and comprehensive loss. On June 21, 2018, Phoenix commenced a special proceeding against EMCORE in the New York Supreme Court, Commercial Division. As part of the special proceeding, Phoenix filed an application for a preliminary injunction in aid of arbitration pursuant to CLPR 7502(c), in connection with the AAA arbitration proceeding in New York. The application resulted in a so-ordered stipulated injunction between EMCORE and Phoenix, which was entered in August 2018. In January 2020, the court granted a motion to confirm the Modified Partial Final Award, vacated the so-ordered stipulated injunction entered in August 2018, and disposed of the special proceeding.

Equity

Equity	12 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Equity	NOTE 14. 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 2010 Equity Incentive Plan (“2010 Plan”), ● the 2012 Equity Incentive Plan (“2012 Plan”), and ● the 2019 Equity Incentive Plan (“2019 Plan”). We issue new shares of common stock to satisfy awards issued under our Equity Plans. Stock Options Most of our stock options vest and become exercisable over a four The following table summarizes stock option activity under the Equity Plans for the fiscal year ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ Weighted ​ Average ​ Aggregate ​ ​ ​ ​ Average ​ Remaining ​ Intrinsic ​ ​ Number of ​ Exercise ​ Contractual Life ​ Value (*) (in ​ ​ Shares ​ Price (in years) ​ thousands) Outstanding as of September 30, 2019 51,854 ​ $ 5.00 ​ Granted — ​ — ​ Exercised (650) ​ ​ 2.89 ​ — Forfeited (1,952) ​ ​ 4.65 ​ Expired (5,187) ​ $ 4.25 ​ Outstanding as of September 30, 2020 44,065 ​ $ 5.14 3.70 ​ $ — Exercisable as of September 30, 2020 41,877 ​ $ 5.18 3.61 ​ $ — Vested and expected to vest as of September 30, 2020 44,065 ​ $ 5.14 3.70 ​ $ — (*) Intrinsic value for stock options represents the “in-the-money” portion or the positive variance between a stock option’s exercise price and the underlying stock price. For the fiscal year ended September 30, 2019, the intrinsic value of options exercised was $0. As of September 30, 2020, there was approximately $2,700 of unrecognized stock-based compensation expense related to non-vested stock options granted under the Equity Plans which is expected to be recognized over an estimated weighted average life of 0.5 years. Valuation Assumptions There were no stock option grants for the fiscal years ended September 30, 2020 and 2019. Time-Based Restricted Stock Time-based restricted stock units (“RSUs”) and restricted stock awards (“RSAs”) granted to employees under the 2010 Plan, 2012 Plan or 2019 Plan typically vest over 3 to 4 years and are subject to forfeiture if employment terminates prior to the vesting or lapse of the restrictions, as applicable. RSUs are not considered issued or outstanding common stock until they vest. RSAs are considered issued and outstanding on the grant date and are subject to forfeiture if specified vesting conditions are not satisfied. The following table summarizes the activity related to RSUs and RSAs subject to time-based vesting requirements for the fiscal year ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Restricted Stock Units ​ Restricted Stock Awards ​ ​ Number of ​ Weighted Average ​ Number of ​ Weighted Average Restricted Stock Activity Shares Grant Date Fair Value Shares Grant Date Fair Value Non-vested as of September 30, 2019 ​ 999,247 ​ $ 4.66 ​ 8,154 ​ $ 8.20 Granted 1,215,810 ​ $ 2.88 — ​ $ — Vested (471,208) ​ $ 4.50 — ​ $ — Forfeited (195,804) ​ $ 3.85 — ​ $ — Non-vested as of September 30, 2020 1,548,045 ​ $ 3.41 8,154 ​ $ 8.20 ​ As of September 30, 2020, there was approximately $4.0 million of remaining unamortized stock-based compensation expense associated with RSUs, which will be expensed over a weighted average remaining service period of approximately 2.6 years. The 1.5 million outstanding non-vested and expected to vest RSUs have an aggregate intrinsic value of approximately $5.0 million and a weighted average remaining contractual term of 2.6 years. For the fiscal years ended September 30, 2020, 2019, and 2018, the intrinsic value of RSUs vested was approximately $1.3 million, $1.4 million and $2.3 million, respectively. For the fiscal years ended September 30, 2019 and 2018, the weighted average grant date fair value of RSUs granted was $3.68 and $5.80 per share, respectively. As of September 30, 2020, there was approximately $1,000 of remaining unamortized stock-based compensation expense associated with RSAs, which will be expensed over a weighted average remaining service period of approximately 0.1 years. Performance Stock Performance based restricted stock units (“PSUs”) and performance based shares of restricted stock (“PRSAs”) granted to employees under the 2012 Plan or 2019 Plan typically vest over 1 to 3 years and are subject to forfeiture in whole, if employment terminates, or in whole or in part, if specified vesting conditions are not satisfied, in each case prior to vesting. PSUs are not considered issued or outstanding common stock until they vest. PRSAs are considered issued and outstanding on the grant date and are subject to forfeiture if specified vesting conditions are not satisfied. PSUs and PRSAs that are granted to our executive officers and key employees are provided as long-term incentive compensation that is based on relative total shareholder return, which measures our performance against the Russell Microcap Index. The following table summarizes the activity related to PSUs and PRSAs for the fiscal year ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance Stock Units ​ Performance Stock Awards ​ ​ ​ ​ Weighted ​ ​ ​ Weighted ​ ​ Number of Shares ​ Average Grant ​ Number of Shares ​ Average Grant Performance Stock Activity (at Target) Date Fair Value (at Target) Date Fair Value Non-vested as of September 30, 2019 ​ 471,824 ​ $ 7.03 ​ 33,333 ​ $ 12.25 Granted 496,000 ​ $ 3.81 — ​ $ 0.00 Vested — ​ $ 0.00 — ​ $ 0.00 Forfeited (99,324) ​ $ 10.55 (33,333) ​ $ 12.25 Non-vested as of September 30, 2020 868,500 ​ $ 4.79 — ​ $ 0.00 ​ As of September 30, 2020, there was approximately $2.1 million of remaining unamortized stock-based compensation expense associated with PSUs, which will be expensed over a weighted average remaining service period of approximately 1.7 years. The 0.9 million outstanding non-vested and expected to vest PSUs have an aggregate intrinsic value of approximately $2.8 million and a weighted average remaining contractual term of 1.7 years. There were no PSUs vested for the fiscal year ended September 30, 2020. For the fiscal years ended September 30, 2019 and 2018, the intrinsic value of PSUs vested was approximately $0.2 million and $1.4 million, respectively. For the fiscal years ended September 30, 2019 and 2018, the weighted average grant date fair value of PSUs granted was $5.19 and $7.62, respectively. As of September 30, 2020, there was no remaining unamortized stock-based compensation expense associated with PRSAs. Stock-based compensation The effect of recording stock-based compensation expense was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock-based Compensation Expense - by award type ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 Employee stock options ​ $ 13 ​ $ 25 ​ $ 32 Restricted stock units and awards ​ 1,755 ​ 1,495 ​ 1,742 Performance stock units and awards ​ 1,243 ​ 685 ​ 1,343 Employee stock purchase plan ​ 214 ​ 180 ​ 276 Outside director equity awards and fees in common stock ​ 291 ​ 221 ​ 255 Total stock-based compensation expense ​ $ 3,516 ​ $ 2,606 ​ $ 3,648 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock-based Compensation Expense - by expense type ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 Cost of revenue ​ $ 692 ​ $ 482 ​ $ 450 Selling, general, and administrative ​ 2,155 ​ 1,478 ​ 2,584 Research and development ​ 669 ​ 646 ​ 614 Total stock-based compensation expense ​ $ 3,516 ​ $ 2,606 ​ $ 3,648 ​ Stock-based compensation within selling, general and administrative expense was lower for the fiscal year ended September 30, 2019 due to the reversal of previously recognized expense associated with the forfeiture of unvested RSUs and PSUs of our former CFO. Capital Stock Our authorized capital stock consists of 50 million shares of common stock, no par value, and 5,882,352 shares of preferred stock, $0.0001 par value. As of September 30, 2020, we had 36.5 million and 29.6 million shares of common stock issued and outstanding, respectively. There were no shares of preferred stock issued or outstanding as of September 30, 2020 and 2019. 401(k) Plan We have a savings plan that qualifies as a deferred salary arrangement under Section 401(k) of the Internal Revenue Code. Under this savings plan, participating employees may defer a portion of their pretax earnings, up to the Internal Revenue Service annual contribution limit. Since June 2015, all employer contributions are made in cash. Our matching contribution in cash for each of the fiscal years ended September 30, 2020, 2019 and 2018 was approximately $1.0 million, $0.6 million and $0.5 million, respectively. Loss Per Share The following table sets forth the computation of basic and diluted net loss per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and Diluted Net Loss Per Share ​ For the Fiscal Years ended September 30, (in thousands, except per share) 2020 2019 2018 Numerator: ​ ​ ​ ​ ​ ​ Loss from operations ​ $ (7,000) ​ $ (35,984) ​ $ (17,453) Undistributed earnings allocated to common shareholders for basic and diluted net income per share ​ (7,000) ​ (35,984) ​ (17,453) Denominator: ​ ​ ​ Denominator for basic and fully diluted net loss per share - weighted average shares outstanding ​ 29,136 ​ 27,983 ​ 27,266 Dilutive options outstanding, unvested stock units, unvested stock awards and ESPP ​ ​ — ​ ​ — ​ ​ — Denominator for diluted net loss per share - adjusted weighted average shares outstanding ​ ​ 29,136 ​ ​ 27,983 ​ ​ 27,266 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss per basic and fully diluted share ​ $ (0.24) ​ $ (1.29) ​ $ (0.64) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted average antidilutive options, unvested restricted stock units and awards, unvested performance stock units and ESPP shares excluded from the computation ​ 1,109 ​ 810 ​ 949 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Average market price of common stock ​ $ 3.03 ​ $ 3.91 ​ $ 5.87 ​ For diluted loss income per share, the denominator includes all outstanding common shares and all potential dilutive common shares to be issued. The anti-dilutive stock options and unvested stock were excluded from the computation of diluted net loss per share for the fiscal years ended September 30, 2020, 2019 and 2018 due to the Company incurring a net loss for the period. Employee Stock Purchase Plan We maintain an Employee Stock Purchase Plan (“ESPP”) that provides employees an opportunity to purchase common stock through payroll deductions. The ESPP is a 6-month duration plan with new participation periods beginning on approximately February 25 and August 26 of each year. The purchase price is set at 85% of the average high and low market price of our common stock on either the first or last trading day of the participation period, whichever is lower, and annual contributions are limited to the lower of 10% of an employee’s compensation or $25,000. Per the amended ESPP and after giving effect to the special dividend paid in July 2016, the total number of shares of common stock on which options may be granted under the ESPP were 3,515,574 shares. We issue new shares of common stock to satisfy the issuance of shares under this stock-based compensation plan. Common stock issued under the ESPP during the fiscal years ended September 30, 2020, 2019 and 2018 totaled approximately 231,000, 197,000 and 171,000 shares, respectively. As of September 30, 2020, the total amount of common stock issued under the ESPP totaled 3,203,100 shares and the total shares remaining available for issuance under the ESPP totaled 312,474. Future Issuances As of September 30, 2020, we had common stock reserved for the following future issuances: ​ ​ ​ ​ ​ Number of Common ​ ​ Stock Shares Available for Future Issuances ​ Future Issuances Exercise of outstanding stock options 44,065 Unvested restricted stock units and awards 1,556,199 Unvested performance stock units and awards (at 200% maximum payout) 1,737,000 Purchases under the employee stock purchase plan 312,474 Issuance of stock-based awards under the Equity Plans 842,822 Purchases under the officer and director share purchase plan 88,741 Total reserved 4,581,301 ​

Segment Data and Related Inform

Segment Data and Related Information	12 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Segment Data and Related Information	NOTE 15. The reportable segments reported below are the Company’s segments for which separate financial information is available and upon which operating results are evaluated by the chief operating decision maker to assess performance and to allocate resources. As a result of organizational changes effective in the beginning of fiscal year 2020, the Company has reassessed its reportable segments and determined that it has two reportable segments, (i) Aerospace and Defense and (ii) Broadband. All prior-period amounts have been adjusted retrospectively to reflect our reportable segment changes. The Company’s Chief Executive Officer is the chief operating decision maker and he assesses the performance of the operating segments and allocates resources based on segment profits. We do not allocate sales and marketing or general and administrative expenses to our segments, because management does not include the information in its measurement of the performance of the operating segments. Also, total assets, interest expense and interest income are not presented by segment because management does not include this information in its measurement of the performance of the operating segments. The Aerospace and Defense segment is comprised of two product lines: (i) Navigation and Inertial Sensing; and (ii) Defense Optoelectronics. The Broadband segment is comprised of three product lines: (i) CATV Lasers and Transmitters; (ii) Chip Devices; and (iii) Other. Information on reportable segments utilized by our chief operating decision maker is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ For the Fiscal Years Ended September 30, ​ ​ 2020 ​ 2019 2018 Revenue: ​ ​ ​ ​ ​ ​ ​ ​ ​ Aerospace and Defense ​ $ 55,240 ​ $ 33,086 ​ $ 13,567 Broadband ​ ​ 54,888 ​ ​ 54,179 ​ ​ 72,050 Total revenue ​ $ 110,128 ​ $ 87,265 ​ $ 85,617 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Segment Profit: ​ ​ ​ ​ ​ ​ ​ ​ ​ Aerospace and Defense gross profit ​ $ 16,729 ​ $ 9,207 ​ $ 2,406 Aerospace & Defense R&D expense ​ ​ 17,469 ​ ​ 10,448 ​ ​ 4,185 Aerospace and Defense segment loss ​ $ (740) ​ $ (1,241) ​ $ (1,779) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Broadband gross profit ​ $ 18,853 ​ $ 5,882 ​ $ 16,081 Broadband R&D expense ​ ​ 2,800 ​ ​ 8,995 ​ ​ 11,202 Broadband segment profit (loss) ​ $ 16,053 ​ $ (3,113) ​ $ 4,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total consolidated segment profit (loss) ​ $ 15,313 ​ $ (4,354) ​ $ 3,100 Unallocated (income) expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ Selling, general and administrative ​ ​ 24,631 ​ ​ 32,080 ​ ​ 21,377 (Gain) loss on sale of assets ​ ​ (2,284) ​ ​ (302) ​ ​ 34 Interest expense (income), net ​ ​ 104 ​ ​ (629) ​ ​ (733) Foreign exchange (gain) loss ​ ​ (198) ​ ​ 427 ​ ​ 434 Other income ​ ​ - ​ ​ - ​ ​ (110) Total unallocated expense ​ ​ 22,253 ​ ​ 31,576 ​ ​ 21,002 Loss before income tax expense ​ $ (6,940) ​ $ (35,930) ​ $ (17,902) ​ Revenue : The following table sets forth revenue by geographic region with revenue assigned to geographic regions based on our customers’ billing address. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue by Geographic Region ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 United States and Canada ​ $ 91,205 ​ $ 68,607 ​ $ 69,543 Asia ​ 9,397 ​ 11,637 ​ 10,386 Europe ​ 5,559 ​ 6,209 ​ 5,422 Other ​ 3,967 ​ 812 ​ 266 Total revenue ​ $ 110,128 ​ $ 87,265 ​ $ 85,617 ​ Significant Customers Long-lived Assets

Selected Quarterly Financial In

Selected Quarterly Financial Information (unaudited)	12 Months Ended
	Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Information (unaudited)	NOTE 16. The following tables present our unaudited consolidated results of operations for the eight most recently ended quarters. We believe that all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts below to present fairly the selected quarterly information when read in conjunction with the consolidated financial statements and notes included elsewhere in this Annual Report. Our results from operations vary substantially from quarter to quarter. Accordingly, the operating results for a quarter are not necessarily indicative of results for any subsequent quarter or for the full year. We have experienced and expect to continue to experience significant fluctuations in quarterly results. ​ ​ EMCORE CORPORATION Quarterly Consolidated Statements of Operations For the Fiscal Year ended September 30, 2020 (in thousands, except income per share) (unaudited) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months ended ​ December 31, March 31, June 30, September 30, ​ ​ 2019 ​ 2020 ​ 2020 ​ 2020 Revenue ​ $ 25,482 ​ $ 23,850 ​ $ 27,266 ​ $ 33,530 Cost of revenue ​ 18,008 ​ 17,423 ​ 18,048 ​ 21,067 Gross profit ​ 7,474 ​ 6,427 ​ 9,218 ​ 12,463 Operating expense (income): ​ ​ ​ ​ Selling, general, and administrative ​ 5,887 ​ 7,139 ​ 5,936 ​ 5,669 Research and development ​ 4,642 ​ 4,584 ​ 4,807 ​ 6,236 Gain on sale of assets ​ (1,602) ​ (315) ​ (312) ​ (55) Total operating expense ​ 8,927 ​ 11,408 ​ 10,431 ​ 11,850 Operating (loss) income ​ (1,453) ​ (4,981) ​ (1,213) ​ 613 Other income (expense): ​ ​ ​ ​ Interest (expense) income, net ​ (15) ​ 1 ​ (40) ​ (50) Foreign exchange gain (loss) ​ 147 ​ (156) ​ (20) ​ 227 Total other income (expense) ​ 132 ​ (155) ​ (60) ​ 177 Loss from operations before income tax expense ​ (1,321) ​ (5,136) ​ (1,273) ​ 790 Income tax (expense) benefit ​ (14) ​ 55 ​ (14) ​ (87) Net (loss) income ​ $ (1,335) ​ $ (5,081) ​ $ (1,287) ​ $ 703 Per share data: ​ ​ ​ ​ Net (loss) income per basic and diluted share ​ $ (0.05) ​ $ (0.18) ​ $ (0.04) ​ $ 0.02 Weighted-average number of basic and diluted shares outstanding ​ 28,832 ​ 29,033 ​ 29,295 ​ 29,386 ​ ​ ​ ​ ​ EMCORE CORPORATION Quarterly Consolidated Statements of Operations For the Fiscal Year ended September 30, 2019 (in thousands, except income per share) (unaudited) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months ended ​ December 31, March 31, June 30, September 30, ​ ​ 2018 ​ 2019 ​ 2019 ​ 2019 Revenue ​ $ 24,001 ​ $ 21,745 ​ $ 17,219 ​ $ 24,300 Cost of revenue ​ 18,193 ​ 15,936 ​ 13,515 ​ 24,532 Gross profit ​ 5,808 ​ 5,809 ​ 3,704 ​ (232) Operating expense (income): ​ ​ ​ ​ Selling, general, and administrative ​ 7,593 ​ 6,956 ​ 9,288 ​ 8,243 Research and development ​ 4,019 ​ 4,360 ​ 4,629 ​ 6,435 Gain on sale of assets ​ — ​ — ​ — ​ (302) Total operating expense ​ 11,612 ​ 11,316 ​ 13,917 ​ 14,376 Operating loss ​ (5,804) ​ (5,507) ​ (10,213) ​ (14,608) Other income (expense): ​ ​ ​ ​ Interest income, net ​ 267 ​ 224 ​ 99 ​ 39 Foreign exchange gain (loss) ​ 14 ​ 304 ​ (349) ​ (396) Total other income (expense) ​ 281 ​ 528 ​ (250) ​ (357) Loss from operations before income tax benefit (expense) ​ (5,523) ​ (4,979) ​ (10,463) ​ (14,965) Income tax expense ​ (15) ​ (15) ​ (14) ​ (10) Net loss ​ $ (5,538) ​ $ (4,994) ​ $ (10,477) ​ $ (14,975) Per share data: ​ ​ ​ ​ Net loss per basic and diluted share ​ $ (0.20) ​ $ (0.18) ​ $ (0.37) ​ $ (0.52) Weighted-average number of basic and diluted shares outstanding ​ 27,534 ​ 27,652 ​ 28,005 ​ 28,734 ​

Subsequent Event

Subsequent Event	12 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Event	NOTE 17 . Subsequent Event On November 17, 2020, the Company entered into an agreement with a customer to resolve certain potential product claims. In exchange for a release of any and all potential claims the customer may have related to the applicable product, the Company has agreed to provide up to $1.5 million of product discounts on future purchases by the customer from the Company. The Company has recorded the full potential expense of $1.5 million in the fiscal year ended September 30, 2020 within Research and Development expense. As the customer is not expected to utilize the entire $1.5 million product discount within the next twelve months, $0.7 million has been recorded within accrued expenses and other current liabilities and $0.8 million has been recorded as other long-term liabilities on the Balance Sheet as of September 30, 2020.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The Company has a history of operating losses and negative cash flows from operations. The Company has taken a number of actions to continue to support its operations and meet its obligations, including headcount reductions and cost reductions. In addition, we generated additional liquidity through the monetization of certain fixed assets and real estate. On May 3, 2020, the Company entered into a Paycheck Protection Program Promissory Note and Agreement (the “PPP Loan Agreement”) with Wells Fargo Bank, N.A. under the Paycheck Protection Program (“PPP”) established under the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”) to receive loan proceeds of approximately $6.5 million (the “PPP Loan”), which the Company received on May 6, 2020. The Company believes that its existing liquidity will be sufficient to meet anticipated cash needs for at least the next 12 months from the issuance date of these financial statements. The consolidated financial statements included herein have been prepared on a going concern basis, which contemplates continuity of operations and the realization of assets and the repayment of liabilities in the ordinary course of business. Management evaluated the significance of the Company’s recent operating losses and determined that the Company’s current cash on hand, operating plan and sources of capital will be sufficient for the Company to continue as a going concern.
Use of Estimates	Use of Estimates 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	Concentration of Credit Risk
Cash and Cash Equivalents	Cash and Cash Equivalents
Restricted Cash	Restricted Cash
Accounts Receivable	Accounts Receivable
Inventory	Inventory Note 8 - Inventory
Property, Plant, and Equipment	Property, Plant, and Equipment ​ ​ ​ ​ Description Estimated Useful Life Building ​ twenty years Equipment ​ three Furniture and fixtures ​ five years Computer hardware and software ​ five Leasehold improvements ​ three ​ 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 loss.
Valuation of Long-lived Assets	Valuation of Long-lived Assets Property, Plant, and Equipment.
Asset Retirement and Environmental Obligations	Asset Retirement and Environmental Obligations Asset Retirement and Environmental Obligations We have known asset retirement conditions, such as certain asset decommissioning and restoration of rented facilities to be performed in the future. Asset Retirement Obligation
Business Combinations	Business Combinations The Company uses the acquisition method of accounting for business combinations and recognizes assets acquired and liabilities assumed at their fair values on the date acquired. Goodwill represents the excess of the purchase price over the fair value of the net assets. The fair values of the assets and liabilities acquired are determined based upon the Company’s valuation using a combination of market, income or cost approaches. In certain circumstances, the allocations of the purchase price are based upon preliminary estimates and assumptions and subject to revision when we receive final information, including appraisals and other analysis. Accordingly, the measurement period for such purchase price allocations will end when the information, or the facts and circumstances, becomes available, but will not exceed twelve months. We will recognize measurement-period adjustments during the period of resolution, including the effect on earnings of any amounts that would have been recorded in previous periods if the accounting had been completed at the acquisition date.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair Value Measurements and Disclosures.
Revenue Recognition and Disaggregation of Revenue	Revenue Recognition To determine the proper revenue recognition, we perform the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) we satisfy a performance obligation. We only apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer. The vast majority of our revenues are from product sales to our customers, pursuant to purchase orders with short lead times. Revenues from product sales are recognized when the customer obtains control of our product, which occurs at a point in time. The Company has elected to account for shipping and handling activities as a fulfillment cost as permitted by the standard. When we perform shipping and handling activities after the transfer of control to the customer (e.g. when control transfers prior to delivery), they are considered fulfillment activities, and accordingly, the costs are accrued when the related revenue is recognized. We expense incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that we would have recognized is one year or less. In certain instances, inventory is maintained by our customers at consigned locations. Revenues from consigned sales are recognized when the customer obtains control of our product, which occurs at a point in time. This is typically when the customer pulls product for use. We use a number of wholesale distributors around the world and recognize revenue when the wholesale distributor obtains control of our product, which occurs at a point in time, typically upon shipment. Our wholesale distributors are contractually obligated to pay us on standard commercial terms, consistent with our end-use customers. We do not sell to wholesale distributors on consignment and do not give wholesale distributors a right of return. In certain instances, prior to 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 (e.g. customer acceptance clause). 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. Revenues are recognized when the customer obtains control of the qualified product, which occurs at a point in time, typically upon shipment. To a lesser extent, we enter into other types of contracts including non-recurring engineering contracts. We recognize revenue for these arrangements over time or at a point in time depending on our evaluation of when the customer obtains control of the promised goods or services. For contracts that include multiple performance obligations, we allocate revenue to each performance obligation based on estimates of the relative standalone selling price that we would charge the customer for each promised product or service. Revenue from products and services transferred to customers over time accounted for 5%, 4%, and 1% of the Company’s revenue for the years ended September 30, 2020, 2019, and 2018, respectively. Remaining Performance Obligations - twelve months Disaggregation of Revenue - Note 15 – Segment Data and Related Information Revenue is also classified by major product category and is presented below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Fiscal Years ended September 30, ​ ​ ​ ​ ​ % of ​ ​ ​ ​ % of ​ ​ ​ % of (in thousands) 2020 Revenue 2019 Revenue 2018 Revenue ​ Navigation and Inertial Sensing ​ $ 38,983 ​ 35 % $ 23,203 ​ 27 % $ 7,149 ​ 8 % Defense Optoelectronics ​ ​ 16,257 ​ 15 ​ ​ 9,883 ​ 11 ​ ​ 6,418 ​ 8 ​ CATV Lasers and Transmitters ​ ​ 44,457 ​ 40 ​ ​ 41,150 ​ 47 ​ ​ 62,000 ​ 72 ​ Chip Devices ​ 4,873 ​ 5 ​ ​ 10,828 ​ 12 ​ ​ 10,050 ​ 12 ​ Other ​ 5,558 ​ 5 ​ ​ 2,201 ​ 3 ​ ​ — ​ — ​ Total revenue ​ $ 110,128 100 % $ 87,265 100 % $ 85,617 100 %
Receivables, Net	Receivables, Net -
Product Warranty Reserves	Product Warranty Reserves Contingencies
Leases	Leases In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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. The new standard was effective for our fiscal year beginning October 1, 2019. We adopted Topic 842 using the modified retrospective approach. The modified retrospective approach provides a method for recording existing leases at the beginning of the period of adoption. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which, among other things, allowed us to carry forward the historical lease classification and we elected the hindsight practical expedient to determine the lease term for existing leases. Additionally, the Company elected an accounting policy to not record operating lease right-of-use (“ROU”) assets and lease liabilities for leases with an initial term of twelve months or less on its consolidated balance sheet. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. Adoption of the new standard resulted in the recording of net operating lease ROU assets of $4.8 million and operating lease liabilities of $4.8 million as of October 1, 2019. The standard did not have an impact on our consolidated results of operations or cash flow. The impact of the adoption of ASC 842 on the balance sheet as of October 1, 2019 was: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As Reported ​ ​ ​ ​ ​ Balance ​ ​ ​ September 30, 2019 ​ ​ Increase ​ ​ October 1, 2019 ( in thousands ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease right-of-use assets ​ $ - ​ $ 4,800 ​ $ 4,800 Total assets ​ ​ 109,562 ​ ​ 4,800 ​ ​ 114,362 Operating lease liabilities ​ ​ - ​ ​ 800 ​ ​ 800 Total current liabilities ​ ​ 30,719 ​ ​ 800 ​ ​ 31,519 Operating lease liabilities non-current ​ ​ - ​ ​ 4,000 ​ ​ 4,000 Total liabilities ​ ​ 32,816 ​ ​ 4,800 ​ ​ 37,616 Total liabilities and equity ​ ​ 109,562 ​ ​ 4,800 ​ ​ 114,362 ​ In connection with the sale/leaseback of non-residential real estate on February 10, 2020, the Company recorded an additional operating ROU assets Note 9 – Property, Plant and Equipment, net The Company determines if an arrangement is a lease at its inception. ROU assets and operating lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The Company uses its estimated incremental borrowing rate in determining the present value of lease payments considering the term of the lease, which is derived from information available at the lease commencement date. The lease term includes renewal options when it is reasonably certain that the option will be exercised, and excludes termination options. To the extent that the Company’s agreements have variable lease payments, the Company includes variable lease payments that depend on an index or a rate and excludes those that depend on facts or circumstances occurring after the commencement date, other than the passage of time. Lease expense for these leases is recognized on a straight-line basis over the lease term. The Company has elected not to recognize ROU assets and lease liabilities that arise from short-term (12 months or less) leases for any class of underlying asset. Operating leases are included in operating lease ROU assets, current operating lease liabilities, and non-current operating lease liabilities in the Company's consolidated balance sheet. The Company’s lease arrangements consist primarily of corporate, manufacturing and other facility agreements as well as various office equipment agreements. The leases expire at various dates through 2035, some of which include options to extend the lease term. The options with the longest potential total lease term consist of options for extension of up to five years following expiration of the original lease term. During the fiscal year ended September 30, 2020, the Company recorded $1.8 million of operating lease expense. During the fiscal years ended September 30, 2019 and 2018, the Company recorded $1.3 million and $1.2 million of rent expense, respectively. The Company's finance leases and short-term leases are immaterial. Supplemental cash information and non-cash activities related to operating leases are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ For the Fiscal Year Ended ​ September 30, 2020 Operating cash outflows from operating leases ​ $ 1,592 Operating lease assets obtained in exchange for new lease liabilities ​ $ 10,791 ​ Maturities of operating lease liabilities as of September 30, 2020 were as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ ​ Amount ​ 2021 ​ $ 1,792 ​ 2022 ​ ​ 1,806 ​ 2023 ​ ​ 1,857 ​ 2024 ​ ​ 1,686 ​ 2025 ​ ​ 1,730 ​ Thereafter ​ ​ 12,366 ​ Total lease payments ​ ​ 21,237 ​ Less imputed interest ​ ​ (6,510) ​ Total ​ $ 14,727 ​ ​ The following is a schedule of future minimum operating lease payments as of September 30, 2019 (in thousands): ​ ​ ​ ​ ​ ​ Amount 2020 ​ $ 988 2021 ​ ​ 839 2022 ​ ​ 824 2023 ​ ​ 853 2024 ​ ​ 655 Thereafter ​ ​ 1,350 Total lease payments ​ $ 5,509 ​ Weighted-average remaining lease term and discount rate related to operating leases are as follows: ​ ​ ​ ​ ​ ​ ​ September 30, 2020 Weighted average remaining lease term (years) ​ 14.4 ​ Weighted average discount rate ​ 6.1 %
Recent Accounting Pronouncements	Recent Accounting Standards or Updates Not Yet Effective ● In June 2016, the FASB issued ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which changes the way entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net earnings. The new standard is effective for annual periods beginning after December 15, 2019, including interim periods within those annual periods. The new standard will be effective for our fiscal year beginning October 1, 2020 and early adoption is permitted. The Company does not expect the adoption of this new guidance to have a significant impact on its consolidated financial statements and related disclosures.
Costs Associated with Exit or Disposal Activities or Restructurings	Expense related to severance and restructuring accruals is included in selling, general, and administrative expense on our consolidated statements of operations and comprehensive (loss) income.
Legal Costs	Professional legal fees are expensed when incurred. We accrue for contingent losses when such losses are probable and reasonably estimable.
Segment Reporting	The reportable segments reported below are the Company’s segments for which separate financial information is available and upon which operating results are evaluated by the chief operating decision maker to assess performance and to allocate resources. As a result of organizational changes effective in the beginning of fiscal year 2020, the Company has reassessed its reportable segments and determined that it has two reportable segments, (i) Aerospace and Defense and (ii) Broadband. All prior-period amounts have been adjusted retrospectively to reflect our reportable segment changes. The Company’s Chief Executive Officer is the chief operating decision maker and he assesses the performance of the operating segments and allocates resources based on segment profits. We do not allocate sales and marketing or general and administrative expenses to our segments, because management does not include the information in its measurement of the performance of the operating segments. Also, total assets, interest expense and interest income are not presented by segment because management does not include this information in its measurement of the performance of the operating segments.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Schedule of Property, Plant and Equipment	​ ​ ​ ​ Description Estimated Useful Life Building ​ twenty years Equipment ​ three Furniture and fixtures ​ five years Computer hardware and software ​ five Leasehold improvements ​ three ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Land ​ $ — ​ $ 3,484 Building ​ — ​ 9,405 Equipment ​ 35,218 ​ 42,308 Furniture and fixtures ​ 1,125 ​ 1,109 Computer hardware and software ​ 3,473 ​ 3,554 Leasehold improvements ​ 3,169 ​ 2,676 Construction in progress ​ 10,301 ​ 9,330 Property, plant, and equipment, gross ​ $ 53,286 ​ $ 71,866 Accumulated depreciation ​ (32,234) ​ (34,643) Property, plant, and equipment, net ​ $ 21,052 ​ $ 37,223
Revenue by Major Product Category	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Fiscal Years ended September 30, ​ ​ ​ ​ ​ % of ​ ​ ​ ​ % of ​ ​ ​ % of (in thousands) 2020 Revenue 2019 Revenue 2018 Revenue ​ Navigation and Inertial Sensing ​ $ 38,983 ​ 35 % $ 23,203 ​ 27 % $ 7,149 ​ 8 % Defense Optoelectronics ​ ​ 16,257 ​ 15 ​ ​ 9,883 ​ 11 ​ ​ 6,418 ​ 8 ​ CATV Lasers and Transmitters ​ ​ 44,457 ​ 40 ​ ​ 41,150 ​ 47 ​ ​ 62,000 ​ 72 ​ Chip Devices ​ 4,873 ​ 5 ​ ​ 10,828 ​ 12 ​ ​ 10,050 ​ 12 ​ Other ​ 5,558 ​ 5 ​ ​ 2,201 ​ 3 ​ ​ — ​ — ​ Total revenue ​ $ 110,128 100 % $ 87,265 100 % $ 85,617 100 %
Schedule of Adoption ASC 842	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As Reported ​ ​ ​ ​ ​ Balance ​ ​ ​ September 30, 2019 ​ ​ Increase ​ ​ October 1, 2019 ( in thousands ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating lease right-of-use assets ​ $ - ​ $ 4,800 ​ $ 4,800 Total assets ​ ​ 109,562 ​ ​ 4,800 ​ ​ 114,362 Operating lease liabilities ​ ​ - ​ ​ 800 ​ ​ 800 Total current liabilities ​ ​ 30,719 ​ ​ 800 ​ ​ 31,519 Operating lease liabilities non-current ​ ​ - ​ ​ 4,000 ​ ​ 4,000 Total liabilities ​ ​ 32,816 ​ ​ 4,800 ​ ​ 37,616 Total liabilities and equity ​ ​ 109,562 ​ ​ 4,800 ​ ​ 114,362
Schedule of supplemental cash flow information	Supplemental cash information and non-cash activities related to operating leases are as follows (in thousands): ​ ​ ​ ​ ​ ​ ​ For the Fiscal Year Ended ​ September 30, 2020 Operating cash outflows from operating leases ​ $ 1,592 Operating lease assets obtained in exchange for new lease liabilities ​ $ 10,791
Schedule of maturities of operating lease liabilities	​ ​ ​ ​ ​ ​ ​ For the Fiscal Year Ended ​ September 30, 2020 Operating cash outflows from operating leases ​ $ 1,592 Operating lease assets obtained in exchange for new lease liabilities ​ $ 10,791
schedule of future minimum lease payments	​ ​ ​ ​ ​ ​ ​ ​ Amount ​ 2021 ​ $ 1,792 ​ 2022 ​ ​ 1,806 ​ 2023 ​ ​ 1,857 ​ 2024 ​ ​ 1,686 ​ 2025 ​ ​ 1,730 ​ Thereafter ​ ​ 12,366 ​ Total lease payments ​ ​ 21,237 ​ Less imputed interest ​ ​ (6,510) ​ Total ​ $ 14,727 ​ ​ The following is a schedule of future minimum operating lease payments as of September 30, 2019 (in thousands): ​ ​ ​ ​ ​ ​ Amount 2020 ​ $ 988 2021 ​ ​ 839 2022 ​ ​ 824 2023 ​ ​ 853 2024 ​ ​ 655 Thereafter ​ ​ 1,350 Total lease payments ​ $ 5,509
Schedule of weighted-average remaining lease term and discount rate	​ ​ ​ ​ ​ ​ ​ September 30, 2020 Weighted average remaining lease term (years) ​ 14.4 ​ Weighted average discount rate ​ 6.1 %

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Schedule of Assets Acquired and Liabilities Assumed	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average Useful (in thousands) ​ Amount ​ Life (years) Purchase price ​ $ 24,978 ​ Developed technology ​ 250 7 Cash acquired ​ ​ 541 Inventories ​ 8,522 Accounts receivable ​ 4,291 Other assets ​ 355 Land and building ​ 12,890 Equipment ​ 2,913 Net liabilities assumed ​ (4,853) Goodwill ​ $ 69
Unaudited Pro Forma Information	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Fiscal Years ended ​ ​ September 30, ( in thousands, except per share data 2019 2018 Revenue ​ $ 107,199 ​ $ 113,398 Net loss ​ $ (42,013) ​ $ (18,136) Net loss per basic and diluted share ​ $ (1.50) ​ $ (0.67) Weighted-average number of basic and diluted shares outstanding ​ 27,983 ​ 27,266

Cash, Cash Equivalents and Re_2

Cash, Cash Equivalents and Restricted Cash (Tables)	12 Months Ended
	Sep. 30, 2020
Cash and Cash Equivalents [Abstract]
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 consolidated statements of cash flows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 2018 Cash ​ $ 11,325 ​ $ 4,338 ​ $ 2,965 Cash equivalents ​ ​ 19,065 ​ ​ 17,236 ​ ​ 60,152 Restricted cash ​ 148 ​ 403 ​ 78 Total cash, cash equivalents and restricted cash ​ $ 30,538 ​ 21,977 ​ 63,195

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The components of accounts receivable consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Accounts receivable, gross ​ $ 25,551 ​ $ 18,645 Allowance for doubtful accounts ​ (227) ​ (148) Accounts receivable, net ​ $ 25,324 ​ $ 18,497 The following table summarizes changes in the allowance for doubtful accounts for the fiscal years ended September 30, 2020, 2019 and 2018. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allowance for Doubtful Accounts ​ For the Fiscal Years ended September 30, (in thousands) ​ 2020 2019 ​ 2018 Balance at beginning of period ​ $ 148 ​ $ 548 ​ $ 22 Provision adjustment - expense, net of recoveries ​ 188 ​ 62 ​ 599 Write-offs and other adjustments - deductions to receivable balances ​ (109) ​ (462) ​ (73) Balance at end of period ​ $ 227 ​ $ 148 ​ $ 548

Inventory (Tables)

Inventory (Tables)	12 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	The components of inventory consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Raw materials ​ $ 13,354 ​ $ 11,510 Work in-process ​ 8,381 ​ 8,176 Finished goods ​ 3,790 ​ 4,365 Inventory balance at end of period ​ $ 25,525 ​ $ 24,051

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	12 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	​ ​ ​ ​ Description Estimated Useful Life Building ​ twenty years Equipment ​ three Furniture and fixtures ​ five years Computer hardware and software ​ five Leasehold improvements ​ three ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Land ​ $ — ​ $ 3,484 Building ​ — ​ 9,405 Equipment ​ 35,218 ​ 42,308 Furniture and fixtures ​ 1,125 ​ 1,109 Computer hardware and software ​ 3,473 ​ 3,554 Leasehold improvements ​ 3,169 ​ 2,676 Construction in progress ​ 10,301 ​ 9,330 Property, plant, and equipment, gross ​ $ 53,286 ​ $ 71,866 Accumulated depreciation ​ (32,234) ​ (34,643) Property, plant, and equipment, net ​ $ 21,052 ​ $ 37,223

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Sep. 30, 2020
Payables and Accruals [Abstract]
Schedule of components of accrued expenses and other current liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of September 30, (in thousands) 2020 2019 Compensation ​ $ 6,916 ​ $ 5,185 Warranty ​ 803 ​ 654 Legal expenses and other professional fees ​ ​ 211 ​ ​ 4,407 Contract liabilities ​ ​ 502 ​ ​ 541 Income and other taxes ​ 1,265 ​ 1,135 Severance and restructuring accruals ​ 17 ​ 172 Other ​ 1,863 ​ 2,427 Accrued expenses and other current liabilities ​ $ 11,577 ​ $ 14,521
Schedule of Restructuring and Related Costs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Severance- Restructuring ​ ​ (in thousands) ​ related accruals ​ related accruals ​ Total Balance as of September 30, 2019 $ 172 $ — $ 172 Expense - charged to accrual ​ 626 ​ — ​ 626 Payments and accrual adjustments ​ (781) ​ — ​ (781) Balance as of September 30, 2020 ​ $ 17 ​ $ — ​ $ 17
Schedule of Product Warranty Accruals	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Product Warranty Accruals ​ For the fiscal year ended September 30, (in thousands) 2020 2019 2018 Balance at beginning of period ​ $ 654 ​ $ 642 ​ $ 684 Provision for product warranty - expense ​ 626 ​ 186 ​ 431 Warranty liability assumed in acquisition liability ​ — ​ 80 ​ — Adjustments and utilization of warranty accrual ​ (477) ​ (254) ​ (473) Balance at end of period ​ $ 803 ​ $ 654 ​ $ 642

Income and Other Taxes (Tables)

Income and Other Taxes (Tables)	12 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes	The Company’s loss from operations before income taxes consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loss before income taxes ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 Domestic ​ $ (7,159) ​ $ (35,100) ​ $ (16,752) Foreign ​ 219 ​ (830) ​ (1,150) Loss before income taxes ​ $ (6,940) ​ $ (35,930) ​ $ (17,902)
Income Tax (Benefit) Expense	The Company’s income tax expense (benefit) consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income tax (benefit) expense ​ For the Fiscal Years Ended September 30, (in thousands) 2020 2019 2018 Federal: ​ ​ ​ Current ​ $ 30 ​ $ — ​ $ (502) Deferred ​ (43) ​ — ​ — ​ ​ (13) ​ — ​ (502) State: ​ ​ ​ Current ​ 98 ​ 54 ​ 53 Deferred ​ (25) ​ — ​ — ​ ​ 73 ​ 54 ​ 53 Foreign: ​ ​ ​ Current ​ — ​ — ​ — Deferred ​ — ​ — ​ — ​ ​ ​ — ​ ​ — ​ ​ — Total income tax expense (benefit) ​ $ 60 ​ $ 54 ​ $ (449)
Schedule of Effective Income Tax Rate Reconciliation	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Provision for Income Taxes ​ For the Fiscal Years Ended September 30, (in thousands) 2020 2019 2018 Income tax benefit computed at U.S. federal statutory rate ​ $ (1,457) ​ $ (7,540) ​ $ (4,346) ​ State tax benefit, net of U.S. federal effect ​ (156) ​ (906) ​ (168) ​ Foreign tax rate differential ​ 13 ​ (28) ​ 36 ​ Effect due to change in tax rate ​ (137) ​ (183) ​ 57,988 ​ Shortfall from stock based compensation ​ 432 ​ 248 ​ 681 ​ Other ​ 94 ​ 223 ​ 216 ​ State net operating loss carryforward adjustment ​ 533 ​ 139 ​ (305) ​ Change in valuation allowance ​ 738 ​ 8,101 ​ (54,551) ​ Income tax expense (benefit) ​ $ 60 ​ $ 54 ​ $ (449) ​ Effective tax rate ​ 1.0 % 0.2 % (2.5) %
Schedule of Deferred Tax Assets and Liabilities	Significant components of our deferred tax assets are as follows: ​ ​ ​ ​ ​ ​ ​ Deferred Tax Assets As of September 30 (in thousands) 2020 2019 Deferred tax assets: ​ ​ ​ Federal net operating loss carryforwards ​ $ 100,363 ​ $ 99,298 Foreign net operating loss carryforwards ​ 1,680 ​ 1,271 Income tax credit carryforwards ​ 2,671 ​ 2,671 Inventory reserves ​ 2,320 ​ 3,535 Accounts receivable reserves ​ 55 ​ 50 Accrued warranty reserve ​ 193 ​ 153 State net operating loss carryforwards ​ 5,970 ​ 6,174 Stock compensation ​ 806 ​ 704 Deferred compensation ​ 443 ​ 404 Fixed assets and intangibles ​ (348) ​ (2,693) ROU lease liability ​ ​ 3,529 ​ ​ — ROU lease assets ​ ​ (3,467) ​ ​ — Other ​ 1,322 ​ 2,255 Total deferred tax assets ​ 115,537 ​ 113,822 Valuation allowance ​ (115,537) ​ (113,891) Net deferred tax liabilities ​ $ — ​ $ (69)
Schedule of Change in Unrecognized Gross Tax Benefits	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, 2018 ​ $ 419 Adjustments based on tax positions related to the current year ​ — Adjustments based on tax positions of prior years ​ — Balance as of September 30, 2019 ​ 419 Adjustments based on tax positions related to the current year ​ — Adjustments based on tax positions of prior years ​ — Balance as of September 30, 2020 ​ $ 419

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Change in Asset Retirement Obligation	​ ​ ​ ​ ​ Asset Retirement Obligations ​ September 30, (in thousands) 2020 Balance at September 30, 2019 ​ $ 1,890 Accretion expense 32 Revision in estimated cash flows 100 Balance at September 30, 2020 ​ $ 2,022

Equity (Tables)

Equity (Tables)	12 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of Stock Options Activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ Weighted ​ Average ​ Aggregate ​ ​ ​ ​ Average ​ Remaining ​ Intrinsic ​ ​ Number of ​ Exercise ​ Contractual Life ​ Value (*) (in ​ ​ Shares ​ Price (in years) ​ thousands) Outstanding as of September 30, 2019 51,854 ​ $ 5.00 ​ Granted — ​ — ​ Exercised (650) ​ ​ 2.89 ​ — Forfeited (1,952) ​ ​ 4.65 ​ Expired (5,187) ​ $ 4.25 ​ Outstanding as of September 30, 2020 44,065 ​ $ 5.14 3.70 ​ $ — Exercisable as of September 30, 2020 41,877 ​ $ 5.18 3.61 ​ $ — Vested and expected to vest as of September 30, 2020 44,065 ​ $ 5.14 3.70 ​ $ — (*) Intrinsic value for stock options represents the “in-the-money” portion or the positive variance between a stock option’s exercise price and the underlying stock price. For the fiscal year ended September 30, 2019, the intrinsic value of options exercised was $0.
Schedule of Restricted Stock Activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Restricted Stock Units ​ Restricted Stock Awards ​ ​ Number of ​ Weighted Average ​ Number of ​ Weighted Average Restricted Stock Activity Shares Grant Date Fair Value Shares Grant Date Fair Value Non-vested as of September 30, 2019 ​ 999,247 ​ $ 4.66 ​ 8,154 ​ $ 8.20 Granted 1,215,810 ​ $ 2.88 — ​ $ — Vested (471,208) ​ $ 4.50 — ​ $ — Forfeited (195,804) ​ $ 3.85 — ​ $ — Non-vested as of September 30, 2020 1,548,045 ​ $ 3.41 8,154 ​ $ 8.20
Schedule of Performance Share Activity	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance Stock Units ​ Performance Stock Awards ​ ​ ​ ​ Weighted ​ ​ ​ Weighted ​ ​ Number of Shares ​ Average Grant ​ Number of Shares ​ Average Grant Performance Stock Activity (at Target) Date Fair Value (at Target) Date Fair Value Non-vested as of September 30, 2019 ​ 471,824 ​ $ 7.03 ​ 33,333 ​ $ 12.25 Granted 496,000 ​ $ 3.81 — ​ $ 0.00 Vested — ​ $ 0.00 — ​ $ 0.00 Forfeited (99,324) ​ $ 10.55 (33,333) ​ $ 12.25 Non-vested as of September 30, 2020 868,500 ​ $ 4.79 — ​ $ 0.00
Schedule of Stock-based Compensation Expense - By Award Type	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock-based Compensation Expense - by award type ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 Employee stock options ​ $ 13 ​ $ 25 ​ $ 32 Restricted stock units and awards ​ 1,755 ​ 1,495 ​ 1,742 Performance stock units and awards ​ 1,243 ​ 685 ​ 1,343 Employee stock purchase plan ​ 214 ​ 180 ​ 276 Outside director equity awards and fees in common stock ​ 291 ​ 221 ​ 255 Total stock-based compensation expense ​ $ 3,516 ​ $ 2,606 ​ $ 3,648
Schedule of Stock-based Compensation Expense - By Expense Type	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Stock-based Compensation Expense - by expense type ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 Cost of revenue ​ $ 692 ​ $ 482 ​ $ 450 Selling, general, and administrative ​ 2,155 ​ 1,478 ​ 2,584 Research and development ​ 669 ​ 646 ​ 614 Total stock-based compensation expense ​ $ 3,516 ​ $ 2,606 ​ $ 3,648
Schedule of Earnings Per Share, Basic and Diluted	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and Diluted Net Loss Per Share ​ For the Fiscal Years ended September 30, (in thousands, except per share) 2020 2019 2018 Numerator: ​ ​ ​ ​ ​ ​ Loss from operations ​ $ (7,000) ​ $ (35,984) ​ $ (17,453) Undistributed earnings allocated to common shareholders for basic and diluted net income per share ​ (7,000) ​ (35,984) ​ (17,453) Denominator: ​ ​ ​ Denominator for basic and fully diluted net loss per share - weighted average shares outstanding ​ 29,136 ​ 27,983 ​ 27,266 Dilutive options outstanding, unvested stock units, unvested stock awards and ESPP ​ ​ — ​ ​ — ​ ​ — Denominator for diluted net loss per share - adjusted weighted average shares outstanding ​ ​ 29,136 ​ ​ 27,983 ​ ​ 27,266 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss per basic and fully diluted share ​ $ (0.24) ​ $ (1.29) ​ $ (0.64) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted average antidilutive options, unvested restricted stock units and awards, unvested performance stock units and ESPP shares excluded from the computation ​ 1,109 ​ 810 ​ 949 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Average market price of common stock ​ $ 3.03 ​ $ 3.91 ​ $ 5.87
Schedule of Common Stock Reserved for Future Issuances	​ ​ ​ ​ ​ Number of Common ​ ​ Stock Shares Available for Future Issuances ​ Future Issuances Exercise of outstanding stock options 44,065 Unvested restricted stock units and awards 1,556,199 Unvested performance stock units and awards (at 200% maximum payout) 1,737,000 Purchases under the employee stock purchase plan 312,474 Issuance of stock-based awards under the Equity Plans 842,822 Purchases under the officer and director share purchase plan 88,741 Total reserved 4,581,301

Segment Data and Related Info_2

Segment Data and Related Information (Tables)	12 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Schedule of Reportable Segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (in thousands) ​ For the Fiscal Years Ended September 30, ​ ​ 2020 ​ 2019 2018 Revenue: ​ ​ ​ ​ ​ ​ ​ ​ ​ Aerospace and Defense ​ $ 55,240 ​ $ 33,086 ​ $ 13,567 Broadband ​ ​ 54,888 ​ ​ 54,179 ​ ​ 72,050 Total revenue ​ $ 110,128 ​ $ 87,265 ​ $ 85,617 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Segment Profit: ​ ​ ​ ​ ​ ​ ​ ​ ​ Aerospace and Defense gross profit ​ $ 16,729 ​ $ 9,207 ​ $ 2,406 Aerospace & Defense R&D expense ​ ​ 17,469 ​ ​ 10,448 ​ ​ 4,185 Aerospace and Defense segment loss ​ $ (740) ​ $ (1,241) ​ $ (1,779) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Broadband gross profit ​ $ 18,853 ​ $ 5,882 ​ $ 16,081 Broadband R&D expense ​ ​ 2,800 ​ ​ 8,995 ​ ​ 11,202 Broadband segment profit (loss) ​ $ 16,053 ​ $ (3,113) ​ $ 4,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total consolidated segment profit (loss) ​ $ 15,313 ​ $ (4,354) ​ $ 3,100 Unallocated (income) expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ Selling, general and administrative ​ ​ 24,631 ​ ​ 32,080 ​ ​ 21,377 (Gain) loss on sale of assets ​ ​ (2,284) ​ ​ (302) ​ ​ 34 Interest expense (income), net ​ ​ 104 ​ ​ (629) ​ ​ (733) Foreign exchange (gain) loss ​ ​ (198) ​ ​ 427 ​ ​ 434 Other income ​ ​ - ​ ​ - ​ ​ (110) Total unallocated expense ​ ​ 22,253 ​ ​ 31,576 ​ ​ 21,002 Loss before income tax expense ​ $ (6,940) ​ $ (35,930) ​ $ (17,902)
Schedule of Revenue by Geographic Region	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revenue by Geographic Region ​ For the Fiscal Years ended September 30, (in thousands) 2020 2019 2018 United States and Canada ​ $ 91,205 ​ $ 68,607 ​ $ 69,543 Asia ​ 9,397 ​ 11,637 ​ 10,386 Europe ​ 5,559 ​ 6,209 ​ 5,422 Other ​ 3,967 ​ 812 ​ 266 Total revenue ​ $ 110,128 ​ $ 87,265 ​ $ 85,617

Selected Quarterly Financial _2

Selected Quarterly Financial Information (unaudited) (Tables)	12 Months Ended
	Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	The following tables present our unaudited consolidated results of operations for the eight most recently ended quarters. We believe that all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts below to present fairly the selected quarterly information when read in conjunction with the consolidated financial statements and notes included elsewhere in this Annual Report. Our results from operations vary substantially from quarter to quarter. Accordingly, the operating results for a quarter are not necessarily indicative of results for any subsequent quarter or for the full year. We have experienced and expect to continue to experience significant fluctuations in quarterly results. ​ ​ EMCORE CORPORATION Quarterly Consolidated Statements of Operations For the Fiscal Year ended September 30, 2020 (in thousands, except income per share) (unaudited) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months ended ​ December 31, March 31, June 30, September 30, ​ ​ 2019 ​ 2020 ​ 2020 ​ 2020 Revenue ​ $ 25,482 ​ $ 23,850 ​ $ 27,266 ​ $ 33,530 Cost of revenue ​ 18,008 ​ 17,423 ​ 18,048 ​ 21,067 Gross profit ​ 7,474 ​ 6,427 ​ 9,218 ​ 12,463 Operating expense (income): ​ ​ ​ ​ Selling, general, and administrative ​ 5,887 ​ 7,139 ​ 5,936 ​ 5,669 Research and development ​ 4,642 ​ 4,584 ​ 4,807 ​ 6,236 Gain on sale of assets ​ (1,602) ​ (315) ​ (312) ​ (55) Total operating expense ​ 8,927 ​ 11,408 ​ 10,431 ​ 11,850 Operating (loss) income ​ (1,453) ​ (4,981) ​ (1,213) ​ 613 Other income (expense): ​ ​ ​ ​ Interest (expense) income, net ​ (15) ​ 1 ​ (40) ​ (50) Foreign exchange gain (loss) ​ 147 ​ (156) ​ (20) ​ 227 Total other income (expense) ​ 132 ​ (155) ​ (60) ​ 177 Loss from operations before income tax expense ​ (1,321) ​ (5,136) ​ (1,273) ​ 790 Income tax (expense) benefit ​ (14) ​ 55 ​ (14) ​ (87) Net (loss) income ​ $ (1,335) ​ $ (5,081) ​ $ (1,287) ​ $ 703 Per share data: ​ ​ ​ ​ Net (loss) income per basic and diluted share ​ $ (0.05) ​ $ (0.18) ​ $ (0.04) ​ $ 0.02 Weighted-average number of basic and diluted shares outstanding ​ 28,832 ​ 29,033 ​ 29,295 ​ 29,386 ​ ​ ​ ​ ​ EMCORE CORPORATION Quarterly Consolidated Statements of Operations For the Fiscal Year ended September 30, 2019 (in thousands, except income per share) (unaudited) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the Three Months ended ​ December 31, March 31, June 30, September 30, ​ ​ 2018 ​ 2019 ​ 2019 ​ 2019 Revenue ​ $ 24,001 ​ $ 21,745 ​ $ 17,219 ​ $ 24,300 Cost of revenue ​ 18,193 ​ 15,936 ​ 13,515 ​ 24,532 Gross profit ​ 5,808 ​ 5,809 ​ 3,704 ​ (232) Operating expense (income): ​ ​ ​ ​ Selling, general, and administrative ​ 7,593 ​ 6,956 ​ 9,288 ​ 8,243 Research and development ​ 4,019 ​ 4,360 ​ 4,629 ​ 6,435 Gain on sale of assets ​ — ​ — ​ — ​ (302) Total operating expense ​ 11,612 ​ 11,316 ​ 13,917 ​ 14,376 Operating loss ​ (5,804) ​ (5,507) ​ (10,213) ​ (14,608) Other income (expense): ​ ​ ​ ​ Interest income, net ​ 267 ​ 224 ​ 99 ​ 39 Foreign exchange gain (loss) ​ 14 ​ 304 ​ (349) ​ (396) Total other income (expense) ​ 281 ​ 528 ​ (250) ​ (357) Loss from operations before income tax benefit (expense) ​ (5,523) ​ (4,979) ​ (10,463) ​ (14,965) Income tax expense ​ (15) ​ (15) ​ (14) ​ (10) Net loss ​ $ (5,538) ​ $ (4,994) ​ $ (10,477) ​ $ (14,975) Per share data: ​ ​ ​ ​ Net loss per basic and diluted share ​ $ (0.20) ​ $ (0.18) ​ $ (0.37) ​ $ (0.52) Weighted-average number of basic and diluted shares outstanding ​ 27,534 ​ 27,652 ​ 28,005 ​ 28,734

Description of Business (Busine

Description of Business (Business Overview) (Details)	12 Months Ended
	Sep. 30, 2020itemsegment
Segment Reporting Information [Line Items]
Number of reporting segments | segment	2
Aerospace And Defense
Segment Reporting Information [Line Items]
Number of Product Lines	2
Broadband
Segment Reporting Information [Line Items]
Number of Product Lines	3

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	May 06, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Oct. 01, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Proceeds From Pay Check Program		$ 6,488
Net operating lease right-of-use assets		14,566			$ 4,800
Operating lease liabilities		14,727
Additional operating lease right use of assets		10,800
Additional operating right use of liabilities		$ 10,800
Paycheck Protection Program
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Proceeds From Pay Check Program	$ 6,500
Restatement
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net operating lease right-of-use assets					4,800
Restatement | ASU 2016-02
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net operating lease right-of-use assets					4,800
Operating lease liabilities					$ 4,800
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from products and services transferred over time, as percentage of overall revenue (percentage)		100.00%	100.00%	100.00%
Transferred over time | Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from products and services transferred over time, as percentage of overall revenue (percentage)		5.00%	4.00%	1.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Property, Plant, and Equipment) (Details)	12 Months Ended
	Sep. 30, 2020
Building
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	20 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	10 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	5 years
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	5 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	7 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (years)	6 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Performance obligations) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Receivables, net	$ 25.3	$ 18.5
Transaction price allocated to performance obligation	$ 1.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be recognized over next twelve months (percentage)	100.00%
Performance obligation satisfaction period (months)	12 months

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Revenue by Product) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 33,530	$ 27,266	$ 23,850	$ 25,482	$ 24,300	$ 17,219	$ 21,745	$ 24,001	$ 110,128	$ 87,265	$ 85,617
Navigation And Inertial Sensing [Member]
Disaggregation of Revenue [Line Items]
Revenue									38,983	23,203	7,149
Defense Optoelectronics [Member]
Disaggregation of Revenue [Line Items]
Revenue									16,257	9,883	6,418
CA TV Lasers And Transmitters [Member]
Disaggregation of Revenue [Line Items]
Revenue									44,457	41,150	62,000
Chips [Member]
Disaggregation of Revenue [Line Items]
Revenue									4,873	10,828	$ 10,050
Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue									$ 5,558	$ 2,201
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk percentage									100.00%	100.00%	100.00%
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark | Navigation And Inertial Sensing [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									35.00%	27.00%	8.00%
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark | Defense Optoelectronics [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									15.00%	11.00%	8.00%
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark | CA TV Lasers And Transmitters [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									40.00%	47.00%	72.00%
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark | Chips [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									5.00%	12.00%	12.00%
Revenue From Products And Services Transferred Over Time Risk | Revenue Benchmark | Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Concentration risk percentage									5.00%	3.00%

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Adoption of ASC 842 (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 14,566	$ 4,800
Total assets	126,241	114,362	$ 109,562
Operating lease liabilities	992	800
Total current liabilities	29,053	31,519	30,719
Operating lease liabilities - non-current	13,735	4,000
Total liabilities	52,092	37,616	32,816
Total liabilities and equity	126,241	114,362	$ 109,562
Restatement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		4,800
Total assets		4,800
Operating lease liabilities		800
Total current liabilities		800
Operating lease liabilities - non-current		4,000
Total liabilities		4,800
Total liabilities and equity		$ 4,800
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total assets	109,562
Total current liabilities	30,719
Total liabilities	32,816
Total liabilities and equity	$ 109,562

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Supplemental cash information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2020USD ($)
Accounting Policies [Abstract]
Operating cash outflows from operating leases	$ 1,592
Operating lease assets obtained in exchange for new lease liabilities	$ 10,791

Summary of Significant Accou_10

Summary of Significant Accounting Policies (Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Lease descriptions
Option to extend the lease term	true
Option to terminate the lease	false
Lease option length in years	5 years
Lease cost
Operating and variable lease expenses	$ 1,800
Rent expense	1,900	$ 1,300	$ 1,200
Maturities of operating lease liabilities
2021	1,792
2022	1,806
2023	1,857
2024	1,686
2025	1,730
Thereafter	12,366
Total lease payments	21,237
Less imputed interest	(6,510)
Lease liability	$ 14,727
Schedule of future minimum lease payments
2020		988
2021		839
2022		824
2023		853
2024		655
Thereafter		1,350
Total lease payments		$ 5,509
Weighted average remaining lease term (years)	14 years 4 months 24 days
Weighted average discount rate	6.10%

Acquisition (Details)

Acquisition (Details) - Systron Donner Inertial, Inc. - USD ($) shares in Thousands, $ in Millions	Jun. 07, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Total purchase price	$ 25
Payments to acquire business	22
Net revenue from acquisition date	9.8
Net income (loss) from acquisition date	$ 0.6
Transaction costs		$ 0.8
Common Stock
Business Acquisition [Line Items]
Common stock issues (shares)	811
Common stock issued	$ 3

Acquisition - Assets Acquired a

Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 07, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Goodwill		$ 69	$ 69
Systron Donner Inertial, Inc.
Business Acquisition [Line Items]
Purchase price	$ 24,978
Cash acquired	541
Inventories	8,522
Accounts receivable	4,291
Other assets	355
Net liabilities assumed	(4,853)
Goodwill	69
Developed technology | Systron Donner Inertial, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 250
Intangible assets useful life (years)	7 years
Land and building | Systron Donner Inertial, Inc.
Business Acquisition [Line Items]
Property, plant and equipment	$ 12,890
Property and equipment | Systron Donner Inertial, Inc.
Business Acquisition [Line Items]
Property, plant and equipment	$ 2,913

Acquisition - Pro Forma Informa

Acquisition - Pro Forma Information (Details) - Systron Donner Inertial, Inc. - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 107,199	$ 113,398
Net loss	$ (42,013)	$ (18,136)
Net loss per diluted share (USD per share)	$ (1.50)	$ (0.67)
Weighted-average number of diluted shares outstanding (shares)	27,983	27,266

Cash, Cash Equivalents and Re_3

Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Cash and Cash Equivalents [Abstract]
Cash	$ 11,325	$ 4,338	$ 2,965
Cash equivalents	19,065	17,236	60,152
Restricted cash	148	403	78
Total cash, cash equivalents and restricted cash	$ 30,538	$ 21,977	$ 63,195

Accounts Receivable (Schedule o

Accounts Receivable (Schedule of Components of Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Receivables [Abstract]
Accounts receivable, gross	$ 25,551	$ 18,645
Allowance for doubtful accounts	(227)	(148)
Accounts receivable, net	$ 25,324	$ 18,497

Accounts Receivable (Allowance

Accounts Receivable (Allowance for Doubtful Accounts Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 148	$ 548	$ 22
Provision adjustment - expense, net of recoveries	188	62	599
Write-offs and other adjustments - deductions to receivable balances	(109)	(462)	(73)
Balance at end of period	$ 227	$ 148	$ 548

Inventory (Schedule of Componen

Inventory (Schedule of Components of Inventory) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 13,354	$ 11,510
Work in-process	8,381	8,176
Finished goods	3,790	4,365
Inventory balance at end of period	$ 25,525	$ 24,051

Property, Plant, and Equipmen_3

Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 53,286	$ 71,866
Accumulated depreciation	(32,234)	(34,643)
Property, plant, and equipment, net	21,052	37,223
Depreciation	5,500	7,100	$ 5,600
Gain on sale of equipment	2,000
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross		3,484
Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross		9,405
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	35,218	42,308
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,125	1,109
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,473	3,554
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,169	2,676
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 10,301	$ 9,330

Property plant and equipment -

Property plant and equipment - Narrative (Details)	Feb. 10, 2020USD ($)	Sep. 30, 2020USD ($)$ / ft²
Property, Plant and Equipment [Abstract]
Sale Lease back Transaction Price	$ 13,200,000
Proceeds from sale of leasebacks	$ 12,800,000
Sale and Leaseback Transaction, Gain (Loss), Net		$ 300,000
Sale And Lease Back Transaction, Lease Term		15 years
Sale Leaseback Transaction, Base Monthly Rent Per Unit | $ / ft²		0.75
Sale Leaseback Transaction, Base Monthly Rent		$ 77,500
Sale Leaseback Transaction, Percentage Of Increase On Lease Rent		3.00%
Additional operating lease right use of assets		$ 10,800,000
Additional Operating Lease, Liability		$ 10,800,000

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Schedule of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Payables and Accruals [Abstract]
Compensation	$ 6,916	$ 5,185
Warranty	803	654
Legal expenses and other professional fees	211	4,407
Contract liabilities	502	541
Income and other taxes	1,265	1,135
Severance and restructuring accruals	17	172
Other	1,863	2,427
Accrued expenses and other current liabilities	$ 11,577	$ 14,521

Accrued Expenses and Other Cu_4

Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 654	$ 642	$ 684
Provision for product warranty - expense	626	186	431
Warranty liability assumed in acquisition liability		80
Adjustments and utilization of warranty accrual	(477)	(254)	(473)
Balance at end of period	$ 803	$ 654	$ 642

Accrued Expenses and Other Cu_5

Accrued Expenses and Other Current Liabilities (Severance and Restructuring Accruals) (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 30, 2019employee	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Payables and Accruals [Abstract]
Number of positions eliminated (employee) | employee	40
Restructuring Charges | $		$ 626	$ 500

Accrued Expenses and Other Cu_6

Accrued Expenses and Other Current Liabilities (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Restructuring Reserve [Roll Forward]
Balance as of September 30, 2019	$ 172
Expense - charged to accrual	626	$ 500
Payments and accrual adjustments	(781)
Balance as of September 30, 2020	17	172
Severance-related accruals
Restructuring Reserve [Roll Forward]
Balance as of September 30, 2019	172
Expense - charged to accrual	626
Payments and accrual adjustments	(781)
Balance as of September 30, 2020	$ 17	$ 172

Credit Facilities and Debt (Nar

Credit Facilities and Debt (Narrative) (Details) $ in Thousands	May 06, 2020USD ($)	Sep. 30, 2020USD ($)LetterOfCredit	Nov. 30, 2020USD ($)LetterOfCredit
Line of Credit Facility [Line Items]
Proceeds From Pay Check Program		$ 6,488
Revolving Credit Facility
Line of Credit Facility [Line Items]
Liquidity requirement, minimum after specific uses		25,000
Liquidity requirement, minimum		10,000
Excess availability requirement, minimum		1,000
Long-term line of credit		0
Standby letters of credit, total amount outstanding		500
Remaining borrowing capacity		7,900
Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Long-term line of credit			$ 0
Standby letters of credit, total amount outstanding			500
Remaining borrowing capacity			$ 9,700
Revolving Credit Facility | Tenth Amendment
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15,000
Revolving Credit Facility | Tenth Amendment | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.75%
Revolving Credit Facility | LIBOR Rate Loan
Line of Credit Facility [Line Items]
Number of standby letters of credit outstanding | LetterOfCredit		1
Revolving Credit Facility | LIBOR Rate Loan | Subsequent Event
Line of Credit Facility [Line Items]
Number of standby letters of credit outstanding | LetterOfCredit			1
Paycheck Protection Program
Line of Credit Facility [Line Items]
Proceeds From Pay Check Program	$ 6,500
Fixed Interest Rate	1.00%
Periodic Payment Due	$ 273,160

Income and Other Taxes (Continu

Income and Other Taxes (Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Domestic									$ (7,159)	$ (35,100)	$ (16,752)
Foreign									219	(830)	(1,150)
Loss before income taxes	$ 790	$ (1,273)	$ (5,136)	$ (1,321)	$ (14,965)	$ (10,463)	$ (4,979)	$ (5,523)	$ (6,940)	$ (35,930)	$ (17,902)

Income and Other Taxes (Income

Income and Other Taxes (Income Tax (Benefit) Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Current federal tax expense (benefit)									$ 30		$ (502)
Deferred federal income tax expense (benefit)									(43)
Total federal income tax (benefit) expense									(13)		(502)
Current state tax expense (benefit)									98	$ 54	53
Deferred state tax expense (benefit)									(25)
Total state income tax (benefit) expense									73	54	53
Total income tax expense (benefit)	$ 87	$ 14	$ (55)	$ 14	$ 10	$ 14	$ 15	$ 15	$ 60	$ 54	$ (449)

Income and Other Taxes (Provisi

Income and Other Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax benefit computed at U.S. federal statutory rate									$ (1,457)	$ (7,540)	$ (4,346)
State tax benefit, net of U.S. federal effect									(156)	(906)	(168)
Foreign tax rate differential									13	(28)	36
Effect due to change in tax rate									(137)	(183)	57,988
Shortfall from stock based compensation									432	248	681
Other									94	223	216
State net operating loss carryforward adjustment									533	139	(305)
Change in valuation allowance									738	8,101	(54,551)
Total income tax expense (benefit)	$ 87	$ 14	$ (55)	$ 14	$ 10	$ 14	$ 15	$ 15	$ 60	$ 54	$ (449)
Effective tax rate (percentage)									1.00%	0.20%	(2.50%)

Income and Other Taxes (Deferre

Income and Other Taxes (Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Federal net operating loss carryforwards	$ 100,363	$ 99,298
Foreign net operating loss carryforwards	1,680	1,271
Income tax credit carryforwards	2,671	2,671
Inventory reserves	2,320	3,535
Accounts receivable reserves	55	50
Accrued warranty reserve	193	153
State net operating loss carryforwards	5,970	6,174
Stock compensation	806	704
Deferred compensation	443	404
Fixed assets and intangibles	(348)	(2,693)
ROU lease liability	3,529
ROU lease assets	(3,467)
Other	1,322	2,255
Total deferred tax assets	115,537	113,822
Valuation allowance	$ (115,537)	(113,891)
Net deferred tax liabilities		$ (69)

Income and Other Taxes (Narrati

Income and Other Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating Loss Carryforwards [Line Items]
Income tax (expense) benefit	$ 87	$ 14	$ (55)	$ 14	$ 10	$ 14	$ 15	$ 15	$ 60	$ 54	$ (449)
Effective tax rate on continuing operations									1.00%	0.20%	(2.50%)
Portion of operating loss carryforward subject to limitation	236,100								$ 236,100
Portion of operating loss carryforward not subject to limitation	241,800								241,800
Interest and penalties accrued as tax liabilities	600				$ 500				600	$ 500
Foreign Income And Research And Development Credit [Member]
Operating Loss Carryforwards [Line Items]
Tax credit	2,700								2,700
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	477,900								477,900
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	6,700								6,700
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 68,500								$ 68,500

Income and Other Taxes (Unrecog

Income and Other Taxes (Unrecognized Gross Tax Benefit) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning of period	$ 419	$ 419
End of period	$ 419	$ 419

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details)	12 Months Ended
	Sep. 30, 2020USD ($)building	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)
Loss Contingencies [Line Items]
Minimum lease payments due next twelve months	$ 1,792,000
Minimum lease payments due in year two	1,806,000
Minimum lease payments due in year three	1,857,000
Minimum lease payments due in year four	1,686,000
Minimum lease payments due in year five	1,730,000
Minimum lease payments due thereafter	12,366,000
Rent expense	$ 1,900,000	$ 1,300,000	$ 1,200,000
Risk-free rate, minimum	1.20%
Risk-free rate, maximum	4.20%
Accretion expense	$ 32,000	100,000	$ 100,000
Lease option length in years	5 years
ARO liability	$ 2,022,000	1,890,000
Property in Alhambra, California
Loss Contingencies [Line Items]
ARO liability	$ 1,900,000	$ 1,800,000
Period of effect driving ARO (years)	30 years
Building
Loss Contingencies [Line Items]
Number of buildings leased | building	5
Number of buildings with new leases signed | building	5
Lease length in years	3 years
Lease option length in years	3 years

Commitments and Contingencies_3

Commitments and Contingencies (ARO Rollforward) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at September 30, 2019	$ 1,890,000
Accretion expense	32,000	$ 100,000	$ 100,000
Revision in estimated cash flows	100,000
Balance at September 30, 2020	$ 2,022,000	$ 1,890,000

Commitments and Contingencies -

Commitments and Contingencies - Phoenix Navigation Components, LLC Legal Proceeding (Details) - Phoenix Navigation Components, LLC Legal Proceedings $ in Millions	Oct. 10, 2019USD ($)	Oct. 01, 2019USD ($)	Jun. 21, 2019USD ($)claimproduct	Dec. 31, 2019USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Jul. 31, 2020USD ($)	Apr. 30, 2020USD ($)	Jan. 31, 2020USD ($)
Loss Contingencies [Line Items]
Total damages sought			$ 21.2
Number of deemed trade secrets used | claim			1
Number of products using deemed trade secrets | product			7
Royalties owed (as percentage of sale price)			7.50%
Amount awarded to other party				$ 0.4	$ 0.4	$ 3.8
Reduction of attorneys' fees owed (as a percent)			10.00%
Royalties owed after first $1 million of payments (as a percentage of sale price)			2.25%
Loss contingency accrual							$ 0.1	$ 0.1	$ 0.2
Payments for Legal Settlements	$ 4.5
Legal fees						$ 5.7
Trade Secrets
Loss Contingencies [Line Items]
Number of pending claims | claim			97
Number of claims settled | claim			5
Royalty
Loss Contingencies [Line Items]
Amount awarded to other party		$ 1
Loss contingency accrual		0.6
Legal Expense
Loss Contingencies [Line Items]
Amount awarded to other party		3.8	$ 3.7
Interest
Loss Contingencies [Line Items]
Amount awarded to other party		$ 0.1

Equity (Narrative) (Details)

Equity (Narrative) (Details)	12 Months Ended
	Sep. 30, 2020plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive compensation plans maintained by the company	3
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, average minimum vesting period (in years)	4 years
Stock options, average maximum vesting period (in years)	5 years
Stock options, contractual life (in years)	10 years

Equity (Schedule of Stock Optio

Equity (Schedule of Stock Options Activity) (Details) - USD ($)	12 Months Ended		24 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020
Number of Shares
Outstanding, beginning of period (in shares)	51,854
Granted (in shares)			0
Exercised (in shares)	(650)
Forfeited (in shares)	(1,952)
Expired (in shares)	(5,187)
Outstanding, end of period (in shares)	44,065	51,854	44,065
Exercisable (in shares)	41,877		41,877
Vested and expected to vest (in shares)	44,065		44,065
Weighted Average Exercise Price
Outstanding, beginning of period (in usd per share)	$ 5
Exercised (in usd per share)	2.89
Forfeited (in usd per share)	4.65
Expired (in usd per share)	4.25
Outstanding, ending of period (in usd per share)	5.14	$ 5	$ 5.14
Exercisable (in usd per share)	5.18		5.18
Vested and expected to vest (in usd per share)	$ 5.14		$ 5.14
Weighted Average Remaining Contractual Life (in years)
Weighted average remaining contractual life, outstanding (in years)	3 years 8 months 12 days
Weighted average remaining contractual life, exercisable (in years)	3 years 7 months 9 days
Weighted average remaining contractual term, vested and expected to vest (in years)	3 years 8 months 12 days
Aggregate Intrinsic Value
Intrinsic value of options exercised		$ 0
Employee Stock Option
Aggregate Intrinsic Value
Unrecognized stock-based compensation expense	$ 2,700		$ 2,700
Expected weighted average recognition period	6 months

Equity (Schedule of Restricted

Equity (Schedule of Restricted Stock Activity) (Details) - $ / shares	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Units
Number of Shares
Non-vested, beginning balance (in shares)	999,247
Granted (in shares)	1,215,810
Vested (in shares)	(471,208)
Forfeited (in shares)	(195,804)
Non-vested, ending balance (in shares)	1,548,045	999,247
Weighted Average Grant Date Fair Value
Non-vested, beginning balance (in usd per share)	$ 4.66
Weighted average fair value (in usd per share)	2.88	$ 3.68	$ 5.80
Vested (in usd per share)	4.50
Forfeited (in usd per share)	3.85
Non-vested, ending balance (in usd per share)	$ 3.41	$ 4.66
Restricted Stock
Number of Shares
Non-vested, beginning balance (in shares)	8,154
Non-vested, ending balance (in shares)	8,154	8,154
Weighted Average Grant Date Fair Value
Non-vested, beginning balance (in usd per share)	$ 8.20
Non-vested, ending balance (in usd per share)	$ 8.20	$ 8.20
Minimum | Equity Incentive Plans 2012 and 2010 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Maximum | Equity Incentive Plans 2012 and 2010 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years

Equity (Restricted Stock Narrat

Equity (Restricted Stock Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense	$ 4,000,000
Weighted average remaining service period (in years)	2 years 7 months 6 days
Unvested stock units (in shares)	1,548,045	999,247
Unvested stock units	$ 5,000,000
Unvested stock units weighted average remaining contractual term (in years)	2 years 7 months 6 days
Intrinsic value vested	$ 1,300,000	$ 1,400,000	$ 2,300,000
Weighted average fair value (in usd per share)	$ 2.88	$ 3.68	$ 5.80
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense	$ 1,000
Weighted average remaining service period (in years)	1 month 6 days
Unvested stock units (in shares)	8,154	8,154

Equity (Schedule of Performance

Equity (Schedule of Performance Stock Activity) (Details) - $ / shares	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Performance Stock Units
Number of Shares
Non-vested, beginning balance (in shares)	471,824
Granted (in shares)	496,000
Vested (in shares)	0
Forfeited (in shares)	(99,324)
Non-vested, ending balance (in shares)	868,500	471,824
Weighted Average Grant Date Fair Value
Non-vested, beginning balance (in usd per share)	$ 7.03
Granted (in usd per share)	3.81	$ 5.19	$ 7.62
Vested (in usd per share)	0
Forfeited (in usd per share)	10.55
Non-vested, ending balance (in usd per share)	$ 4.79	$ 7.03
Performance Stock Awards
Number of Shares
Non-vested, beginning balance (in shares)	33,333
Forfeited (in shares)	(33,333)
Non-vested, ending balance (in shares)		33,333
Weighted Average Grant Date Fair Value
Non-vested, beginning balance (in usd per share)	$ 12.25
Granted (in usd per share)	0
Vested (in usd per share)	0
Forfeited (in usd per share)	12.25
Non-vested, ending balance (in usd per share)	$ 0	$ 12.25
Two Thousand Twelve Equity Incentive Plan | Minimum | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Two Thousand Twelve Equity Incentive Plan | Maximum | Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years

Equity (Performance Stock Narra

Equity (Performance Stock Narrative) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense	$ 2,100,000
Weighted average remaining service period (in years)	1 year 8 months 12 days
Unvested stock units (in shares)	868,500	471,824
Intrinsic value of non-vested and expected to vest PSUs	$ 2,800,000
Average remaining contractual term (in years)	1 year 8 months 12 days
Vested (in shares)	0
Intrinsic value vested		$ 200,000	$ 1,400,000
Weighted average fair value (in usd per share)	$ 3.81	$ 5.19	$ 7.62
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense	$ 0
Unvested stock units (in shares)		33,333
Weighted average fair value (in usd per share)	$ 0

Equity (Schedule of Stock-based

Equity (Schedule of Stock-based Compensation Expense - by Award Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,516	$ 2,606	$ 3,648
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	13	25	32
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,755	1,495	1,742
Performance stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,243	685	1,343
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	214	180	276
Outside director equity awards and fees in common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 291	$ 221	$ 255

Equity (Schedule of Stock-bas_2

Equity (Schedule of Stock-based Compensation Expense - by Expense Category) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 3,516	$ 2,606	$ 3,648
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	692	482	450
Selling, general, and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,155	1,478	2,584
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 669	$ 646	$ 614

Equity (Capital Stock) (Details

Equity (Capital Stock) (Details) - $ / shares	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	5,882,352
Preferred stock par value (in usd per share)	$ 0.0001
Common stock, shares issued (in shares)	36,461,000	35,803,000
Common stock, shares outstanding (in shares)	29,551,000	28,893,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0

Equity (401k) (Details)

Equity (401k) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Matching contribution	$ 1	$ 0.6	$ 0.5

Equity (Schedule of Earnings pe

Equity (Schedule of Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Loss from operations	$ 703	$ (1,287)	$ (5,081)	$ (1,335)	$ (14,975)	$ (10,477)	$ (4,994)	$ (5,538)	$ (7,000)	$ (35,984)	$ (17,453)
Undistributed earnings allocated to common shareholders for basic and diluted net income per share									$ (7,000)	$ (35,984)	$ (17,453)
Weighted-average number of basic and diluted shares outstanding	29,386	29,295	29,033	28,832	28,734	28,005	27,652	27,534	29,136	27,983	27,266
Dilutive options outstanding, unvested stock units, unvested stock awards and ESPP									29,136	27,983	27,266
Denominator for diluted net loss per share - adjusted weighted average shares outstanding									29,136	27,983	27,266
Net loss per basic and diluted share (in dollars per share)	$ 0.02	$ (0.04)	$ (0.18)	$ (0.05)	$ (0.52)	$ (0.37)	$ (0.18)	$ (0.20)	$ (0.24)	$ (1.29)	$ (0.64)
Weighted average antidilutive options, unvested restricted stock units and awards, unvested performance stock units and ESPP shares excluded from the computation									1,109	810	949
Average market price of common stock (in dollars per share)									$ 3.03	$ 3.91	$ 5.87

Equity (Employee Stock Purchase

Equity (Employee Stock Purchase Plan) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate common shares issued under ESPP (in shares)	3,203,100
Purchases under the employee stock purchase plan (in shares)	312,474
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock - ESPP (in shares)	231,000	197,000	171,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP offering period (months)	6 months
Purchase price (as percentage of market price)	85.00%
Annual contribution (as percentage of compensation)	10.00%
Annual contribution	$ 25,000
Total number of shares available under ESPP				3,515,574

Equity (Schedule of Common Stoc

Equity (Schedule of Common Stock Reserved for Future Issuances) (Details) - shares	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of outstanding stock options (in shares)	44,065	51,854
Purchases under the employee stock purchase plan (in shares)	312,474
Issuance of stock-based awards under the Equity Plans (in shares)	842,822
Purchases under the officer and director share purchase plan (in shares)	88,741
Total reserved (in shares)	4,581,301
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock units (in shares)	1,556,199
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested award potential, percentage	200.00%
Unvested stock units (in shares)	868,500	471,824
Unvested performance stock units (in shares)	1,737,000

Segment Data and Related Info_3

Segment Data and Related Information (Schedule of Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 33,530	$ 27,266	$ 23,850	$ 25,482	$ 24,300	$ 17,219	$ 21,745	$ 24,001	$ 110,128	$ 87,265	$ 85,617
Gross profit	12,463	9,218	6,427	7,474	(232)	3,704	5,809	5,808	35,582	15,089	18,487
R&D expense	6,236	4,807	4,584	4,642	6,435	4,629	4,360	4,019	20,269	19,443	15,387
Total consolidated segment profit (loss)									15,313	(4,354)	3,100
Unallocated (income) expense:
Selling, general, and administrative	5,669	5,936	7,139	5,887	8,243	9,288	6,956	7,593	24,631	32,080	21,377
(Gain) loss on sale of assets	(55)	(312)	(315)	(1,602)	(302)				(2,284)	(302)	34
Interest (income) expense, netInterest expense (income), net	50	40	(1)	15	(39)	(99)	(224)	(267)	104	(629)	(733)
Foreign exchange loss	(227)	20	156	(147)	396	349	(304)	(14)	(198)	427	434
Other income											(110)
Total unallocated expense									22,253	31,576	21,002
Loss before income tax expense	$ 790	$ (1,273)	$ (5,136)	$ (1,321)	$ (14,965)	$ (10,463)	$ (4,979)	$ (5,523)	(6,940)	(35,930)	(17,902)
Aerospace and Defense revenue
Segment Reporting Information [Line Items]
Revenue									55,240	33,086	13,567
Broadband revenue
Segment Reporting Information [Line Items]
Revenue									54,888	54,179	72,050
Aerospace And Defense
Segment Reporting Information [Line Items]
Gross profit									16,729	9,207	2,406
R&D expense									17,469	10,448	4,185
Total consolidated segment profit (loss)									(740)	(1,241)	(1,779)
Broadband
Segment Reporting Information [Line Items]
Gross profit									18,853	5,882	16,081
R&D expense									2,800	8,995	11,202
Total consolidated segment profit (loss)									$ 16,053	$ (3,113)	$ 4,879

Segment Data and Related Info_4

Segment Data and Related Information (Schedule of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Segment revenue	$ 33,530	$ 27,266	$ 23,850	$ 25,482	$ 24,300	$ 17,219	$ 21,745	$ 24,001	$ 110,128	$ 87,265	$ 85,617
United States and Canada
Segment Reporting Information [Line Items]
Segment revenue									91,205	68,607	69,543
Asia
Segment Reporting Information [Line Items]
Segment revenue									9,397	11,637	10,386
Europe
Segment Reporting Information [Line Items]
Segment revenue									5,559	6,209	5,422
Other
Segment Reporting Information [Line Items]
Segment revenue									$ 3,967	$ 812	$ 266

Segment Data and Related Info_5

Segment Data and Related Information (Narrative) (Details)	12 Months Ended
	Sep. 30, 2020productcustomersegment	Sep. 30, 2019customer	Sep. 30, 2018customer
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of reporting segments | segment	2
Concentration risk, customers | customer	3	3	2
Percentage of long-lived assets located in the United States	97.00%	85.00%
Aerospace and Defense Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Product Lines	2
Broadband segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Product Lines	3
Customer Concentration Risk | Sales Revenue, Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Concentration risk percentage	57.00%	55.00%	60.00%

Selected Quarterly Financial _3

Selected Quarterly Financial Information (unaudited) (Summary of Selected Quarter Financial Information) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 33,530	$ 27,266	$ 23,850	$ 25,482	$ 24,300	$ 17,219	$ 21,745	$ 24,001	$ 110,128	$ 87,265	$ 85,617
Cost of revenue	21,067	18,048	17,423	18,008	24,532	13,515	15,936	18,193	74,546	72,176	67,130
Gross profit	12,463	9,218	6,427	7,474	(232)	3,704	5,809	5,808	35,582	15,089	18,487
Operating expense (income):
Selling, general, and administrative	5,669	5,936	7,139	5,887	8,243	9,288	6,956	7,593	24,631	32,080	21,377
Research and development	6,236	4,807	4,584	4,642	6,435	4,629	4,360	4,019	20,269	19,443	15,387
Gain on sale of assets	(55)	(312)	(315)	(1,602)	(302)				(2,284)	(302)	34
Total operating expense	11,850	10,431	11,408	8,927	14,376	13,917	11,316	11,612	42,616	51,221	36,798
Operating loss	613	(1,213)	(4,981)	(1,453)	(14,608)	(10,213)	(5,507)	(5,804)	(7,034)	(36,132)	(18,311)
Other income:
Interest income, net	(50)	(40)	1	(15)	39	99	224	267	(104)	629	733
Foreign exchange gain (loss)	227	(20)	(156)	147	(396)	(349)	304	14	198	(427)	(434)
Other income											110
Total other income	177	(60)	(155)	132	(357)	(250)	528	281	94	202	409
Loss before income taxes	790	(1,273)	(5,136)	(1,321)	(14,965)	(10,463)	(4,979)	(5,523)	(6,940)	(35,930)	(17,902)
Income tax (expense) benefit	(87)	(14)	55	(14)	(10)	(14)	(15)	(15)	(60)	(54)	449
Net loss	$ 703	$ (1,287)	$ (5,081)	$ (1,335)	$ (14,975)	$ (10,477)	$ (4,994)	$ (5,538)	$ (7,000)	$ (35,984)	$ (17,453)
Per share data:
Net loss per basic and diluted share (in dollars per share)	$ 0.02	$ (0.04)	$ (0.18)	$ (0.05)	$ (0.52)	$ (0.37)	$ (0.18)	$ (0.20)	$ (0.24)	$ (1.29)	$ (0.64)
Weighted-average number of basic and diluted shares outstanding	29,386	29,295	29,033	28,832	28,734	28,005	27,652	27,534	29,136	27,983	27,266

Subsequent Event (Details)

Subsequent Event (Details) - Subsequent Event - Agreement with customer to resolve certain potential product claims $ in Millions	Nov. 30, 2020USD ($)
Accrued expenses and other current liabilities
Subsequent Event [Line Items]
Product discount amount	$ 0.7
Other long-term liabilities
Subsequent Event [Line Items]
Product discount amount	0.8
Maximum
Subsequent Event [Line Items]
Product discount amount	$ 1.5