EMCORE (EMKR) 10-Q 5 Feb 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Dec. 31, 2020	Feb. 03, 2021
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-36632
Entity Registrant Name	EMCORE CORP
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 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 Common Stock, Shares Outstanding		29,782,853
Entity Central Index Key	0000808326
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--09-30
Amendment Flag	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 33,426,000	$ 25,482,000
Cost of revenue	20,854,000	18,008,000
Gross profit	12,572,000	7,474,000
Operating expense:
Selling, general, and administrative	5,798,000	5,887,000
Research and development	4,296,000	4,642,000
Gain on sale of assets	(29,000)	(1,602,000)
Total operating expense	10,065,000	8,927,000
Operating income (loss)	2,507,000	(1,453,000)
Other income:
Interest expense, net	(49,000)	(15,000)
Foreign exchange gain	237,000	147,000
Total other income	188,000	132,000
Income (loss) before income tax expense	2,695,000	(1,321,000)
Income tax expense	(126,000)	(14,000)
Net income (loss)	2,569,000	(1,335,000)
Foreign exchange translation adjustment	(10,000)	(36,000)
Comprehensive income (loss)	$ 2,559,000	$ (1,371,000)
Per share data:
Net income (loss) per basic share	$ 0.09	$ (0.05)
Weighted-average number of basic shares outstanding	29,503	28,832
Net income (loss) per diluted share	$ 0.08	$ (0.05)
Weighted-average number of diluted shares outstanding	30,377	28,832

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 31,120	$ 30,390
Restricted cash	38	148
Accounts receivable, net of allowance of $234 and $227, respectively	27,276	25,324
Contract assets	582	1,566
Inventory	27,855	25,525
Prepaid expenses and other current assets	4,283	5,589
Assets held for sale	1,661	1,568
Total current assets	92,815	90,110
Property, plant, and equipment, net	20,558	21,052
Goodwill	69	69
Operating lease right-of-use assets	14,262	14,566
Other intangible assets, net	193	202
Other non-current assets	229	242
Total assets	128,126	126,241
Current liabilities:
PPP liability - current	1,093
Accounts payable	17,158	16,484
Accrued expenses and other current liabilities	9,650	11,577
Operating lease liabilities - current	979	992
Total current liabilities	28,880	29,053
PPP liability - non-current	5,395	6,488
Operating lease liabilities - non-current	13,481	13,735
Asset retirement obligations	2,041	2,022
Other long-term liabilities	794	794
Total liabilities	50,591	52,092
Commitments and contingencies (Note 11)
Shareholders' equity:
Common stock, no par value, 50,000 shares authorized; 36,693 shares issued and 29,783 shares outstanding as of December 31, 2020; 36,461 shares issued and 29,551 shares outstanding as of September 30, 2020	745,188	744,361
Treasury stock at cost; 6,910 shares	(47,721)	(47,721)
Accumulated other comprehensive income	908	918
Accumulated deficit	(620,840)	(623,409)
Total shareholders' equity	77,535	74,149
Total liabilities and shareholders' equity	$ 128,126	$ 126,241

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Accounts receivable:
Allowance for doubtful accounts	$ 234	$ 227
Shareholders' equity:
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	36,693,000	36,461,000
Common stock, shares outstanding (in shares)	29,783,000	29,551,000
Treasury stock, shares held (in shares)	6,910,000	6,910,000

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit	Total
Beginning balance (in shares) at Sep. 30, 2019	28,893
Common Stock, Number of Shares [Abstract]
Stock-based compensation (in shares)	55
Stock option exercises (in shares)	0
Ending balance (in shares) at Dec. 31, 2019	28,948
Balance, beginning of period at Sep. 30, 2019	$ 739,926		$ 950	$ (616,409)
Common Stock, Number of Shares [Abstract]
Stock-based compensation	801
Stock option exercises	0
Tax withholding paid on behalf of employees for stock-based awards	(47)
Translation adjustment			(36)		$ (36)
Net loss				(1,335)	(1,335)
Balance, end of period at Dec. 31, 2019	$ 740,680	$ (47,721)	914	(617,744)	$ 76,129
Beginning balance (in shares) at Sep. 30, 2020	29,551				29,551
Common Stock, Number of Shares [Abstract]
Stock-based compensation (in shares)	230
Stock option exercises (in shares)	2
Ending balance (in shares) at Dec. 31, 2020	29,783				29,783
Balance, beginning of period at Sep. 30, 2020	$ 744,361		918	(623,409)
Common Stock, Number of Shares [Abstract]
Stock-based compensation	903
Stock option exercises	7
Tax withholding paid on behalf of employees for stock-based awards	(83)
Translation adjustment			(10)		$ (10)
Net loss				2,569	2,569
Balance, end of period at Dec. 31, 2020	$ 745,188	$ (47,721)	$ 908	$ (620,840)	$ 77,535

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 2,569	$ (1,335)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization expense	1,005	1,981
Stock-based compensation expense	903	801
Provision adjustments related to credit loss	6	111
Provision adjustments related to product warranty	171	49
Gain on disposal of property, plant and equipment	(29)	(1,602)
Other	(290)	(259)
Total non-cash adjustments	1,766	1,081
Changes in operating assets and liabilities:
Accounts receivable and contract assets	(970)	(1,450)
Inventory	(1,998)	(902)
Other assets	1,694	(2,809)
Accounts payable	836	794
Accrued expenses and other current liabilities	(2,371)	(1,358)
Total change in operating assets and liabilities	(2,809)	(5,725)
Net cash provided by (used in) operating activities	1,526	(5,979)
Cash flows from investing activities:
Purchase of equipment	(870)	(1,506)
Proceeds from disposal of property, plant and equipment	0	1,947
Net cash (used in) provided by investing activities	(870)	441
Cash flows from financing activities:
Net payments on credit facilities	0	(1,038)
Proceeds from exercise of equity awards	8	0
Taxes paid related to net share settlement of equity awards	(83)	(47)
Net cash used in financing activities	(75)	(1,085)
Effect of exchange rate changes provided by foreign currency	39	32
Net increase (decrease) in cash, cash equivalents and restricted cash	620	(6,591)
Cash, cash equivalents and restricted cash at beginning of period	30,538	21,977
Cash, cash equivalents and restricted cash at end of period	31,158	15,386
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	15	47
NON-CASH INVESTING AND FINANCING ACTIVITIES
Changes in accounts payable related to purchases of equipment	$ (350)	$ (725)

Description of Business

Description of Business	3 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	EMCORE Corporation Notes to our Condensed Consolidated Financial Statements NOTE 1. Description of Business 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 (“CATV”) directly on fiber, and today is a leading provider of advanced Mixed-Signal Optics products that enable communications systems and service providers to meet growing demand for increased bandwidth and connectivity. The Mixed-Signal Optics technology at the heart of our broadband communications products is shared with our fiber optic gyros and inertial sensors to provide the aerospace and defense markets with state-of-the-art navigation systems technology. With the acquisition of Systron Donner Inertial, Inc. (“SDI”), a navigation systems provider with a scalable, chip-based platform for higher volume gyro applications utilizing Quartz MEMS technology, in June 2019, EMCORE further expanded its portfolio of gyros and inertial sensors with SDI’s quartz MEMS gyro and accelerometer technology. EMCORE has fully vertically-integrated manufacturing capability through our indium phosphide compound semiconductor wafer fabrication facility at our headquarters in Alhambra, CA, and through our quartz processing and sensor manufacturing facility in Concord, CA. These facilities support EMCORE’s vertically-integrated manufacturing strategy for quartz and fiber optic gyro products, for navigation systems, and for our chip, laser, transmitter, and receiver products for broadband applications. With both analog and digital circuits on multiple chips, or even a single chip, the value of Mixed-Signal device solutions is often substantially greater than traditional digital applications and requires a specialized expertise held by EMCORE which is unique in the optics industry. Interim Financial Statements The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim information, and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X promulgated by the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by U.S. GAAP for annual financial statements. In our opinion, the interim financial statements reflect all adjustments, which are all normal recurring adjustments, that are necessary to provide a fair presentation of the financial results for the interim periods presented. Operating results for interim periods are not necessarily indicative of results that may be expected for an entire fiscal year. The condensed consolidated balance sheet as of September 30, 2020 has been derived from the audited consolidated financial statements as of such date. For a more complete understanding of our business, financial position, operating results, cash flows, risk factors and other matters, please refer to our Annual Report on Form 10-K for the fiscal year ended September 30, 2020. Significant Accounting Policies and Estimates Our significant accounting policies are detailed in “Note 2 - Summary of Significant Accounting Policies” of our Annual Report on Form 10-K for the year ended September 30, 2020. There have been no significant changes to our accounting policies during the three months ended December 31, 2020. The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities, as of the date of the financial statements, and the reported amounts of revenue and expenses during the reported period. If these estimates differ significantly from actual results, the impact to the condensed consolidated financial statements may be material. There have been no material changes in our critical accounting policies and estimates from those disclosed in our Annual Report on Form 10-K for the fiscal year ended September 30, 2020. Please refer to Part II, Item 7 of our Annual Report on Form 10-K for the fiscal year ended September 30, 2020 for a discussion of our critical accounting policies and estimates. Disaggregation of Revenue - Note 13 – Segment Data and Related Information Revenue is also classified by major product category and is presented below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended December 31, ​ ​ ​ ​ ​ % of ​ ​ ​ ​ % of (in thousands) 2020 Revenue 2019 Revenue Navigation and Inertial Sensing ​ $ 9,202 ​ 28 % $ 10,267 ​ 40 % Defense Optoelectronics ​ ​ 4,434 ​ 13 % ​ 3,437 ​ 13 % CATV Lasers and Transmitters ​ ​ 17,315 ​ 52 % ​ 9,383 ​ 37 % Chip Devices ​ 743 2 % ​ 1,555 6 % Other ​ 1,732 5 % ​ 840 4 % Total revenue ​ $ 33,426 100 % $ 25,482 100 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	NOTE 2. Recent Accounting Pronouncements (a) New Accounting Updates Recently Adopted ● In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 was effective for our fiscal year beginning October 1, 2020. We adopted the new standard on October 1, 2020, and it did not have a material impact on its condensed consolidated financial statements. ​ (b) Recent Accounting Standards or Updates Not Yet Effective ● In December 2019, the FASB issued ASU 2019-12 Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes , which removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The new standard is effective for annual periods beginning after December 15, 2020, including interim periods within those annual periods. The new standard will be effective for our fiscal year beginning October 1, 2021 and early adoption is permitted. The Company is currently evaluating the new guidance to determine the impact it may have on its condensed consolidated financial statements and related disclosures.

Cash, Cash Equivalents and Rest

Cash, Cash Equivalents and Restricted Cash	3 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	NOTE 3. Cash, Cash Equivalents and Restricted Cash The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the unaudited consolidated balance sheets that sum to the total of the same amounts shown in the unaudited statements of consolidated cash flows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of As of ​ ​ December 31, ​ September 30, ​ (in thousands) ​ 2020 ​ 2020 ​ Cash ​ $ 12,055 ​ $ 11,325 ​ Cash equivalents ​ ​ 19,065 ​ ​ 19,065 ​ Restricted cash ​ 38 ​ 148 ​ Total cash, cash equivalents and restricted cash ​ $ 31,158 ​ $ 30,538 ​ ​ The Company’s restricted cash includes cash balances which are legally or contractually restricted in use. The Company’s restricted cash is included in current assets as of December 31, 2020 and September 30, 2020.

Fair Value Accounting

Fair Value Accounting	3 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Accounting	NOTE 4. Fair Value Accounting Accounting Standards Codification Topic 820 (“ASC 820”), Fair Value Measurement, ● 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, contract assets, other current assets, and accounts payable approximate fair value because of the short maturity of these instruments.

Accounts Receivable

Accounts Receivable	3 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Accounts Receivable	NOTE 5. Accounts Receivable The components of accounts receivable consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Accounts receivable, gross ​ $ 27,510 ​ $ 25,551 Allowance for credit loss ​ (234) ​ (227) Accounts receivable, net ​ $ 27,276 ​ $ 25,324 ​ The allowance for credit loss is based on the age of receivables and a specific identification of receivables considered at risk of collection.

Inventory

Inventory	3 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventory	NOTE 6. Inventory The components of inventory consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Raw materials ​ $ 14,795 ​ $ 13,354 Work in-process ​ 8,780 ​ 8,381 Finished goods ​ 4,280 ​ 3,790 Inventory balance at end of period ​ $ 27,855 ​ $ 25,525 ​

Property, Plant, and Equipment,

Property, Plant, and Equipment, net	3 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment, net	NOTE 7. Property, Plant, and Equipment, net The components of property, plant, and equipment, net consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Equipment ​ $ 36,074 ​ $ 35,218 Furniture and fixtures ​ 1,125 ​ 1,125 Computer hardware and software ​ 3,476 ​ 3,473 Leasehold improvements ​ 3,249 ​ 3,169 Construction in progress ​ 9,933 ​ 10,301 Property, plant, and equipment, gross ​ $ 53,857 ​ $ 53,286 Accumulated depreciation ​ (33,299) ​ (32,234) Property, plant, and equipment, net ​ $ 20,558 ​ $ 21,052 ​ During the three months ended December 31, 2020 and 2019, the Company sold certain equipment and recognized a gain on sale of assets of approximately $29,000 and $1.6 million, respectively. In addition, in the fiscal year ended September 30, 2020, the Company entered into agreements to sell additional equipment and these assets have been reclassified to assets held for sale.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	3 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	NOTE 8. Accrued Expenses and Other Current Liabilities The components of accrued expenses and other current liabilities consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Compensation ​ $ 5,140 ​ $ 6,916 Warranty ​ 921 ​ 803 Legal expenses and other professional fees ​ ​ 210 ​ ​ 211 Contract liabilities ​ ​ 77 ​ ​ 502 Income and other taxes ​ 1,411 ​ 1,265 Severance and restructuring accruals ​ — ​ 17 Other ​ 1,891 ​ 1,863 Accrued expenses and other current liabilities ​ $ 9,650 ​ $ 11,577 ​

Credit Facilities and Debt

Credit Facilities and Debt	3 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Credit Facilities and Debt	NOTE 9. Credit Facilities and Debt 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, subject to a borrowing base formula, that can be used for working capital requirements, letters of credit, acquisitions, and other general corporate purposes subject to a requirement, for certain specific uses, that the Company has 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 December 31, 2020, there was no 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, but it can make no assurance that forgiveness will be granted in part or in whole. As of December 31, 2020, $1.1 million is recorded in current liabilities and $5.4 million is recorded in long-term liabilities on the Company’s condensed consolidated balance sheet.

Income and Other Taxes

Income and Other Taxes	3 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income and Other Taxes	NOTE 10. Income and Other Taxes During each of the three months ended December 31, 2020 and 2019, the Company recorded income tax expense of approximately $126,000 and $14,000, respectively. Income tax expense for the three months ended December 31, 2020 and 2019 is composed primarily of state tax expense. The increase in income tax expense is due to increased revenues and the State of California’s temporary suspension of NOL utilization. For the three months ended December 31, 2020 and 2019, the effective tax rate on continuing operations was 0.4% and 0.0%, respectively. The increased tax rate for the three months ended December 31, 2020 is primarily due to increased revenue in the three months ended December 31, 2020 and the State of California’s temporary suspension of NOL utilization. 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 December 31, 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 December 31, 2020. On a quarterly basis, the Company evaluates 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 three months ended December 31, 2020 and 2019, there were no material increases or decreases in unrecognized tax benefits. As of December 31, 2020 and September 30, 2020, we had approximately $0.6 million of interest and penalties accrued as tax liabilities on our balance sheet. We expect that $0.4 million of uncertain tax benefit will be settled within the next 12 months, which will impact the effective tax rate. Interest that is accrued on tax liabilities is recorded within interest expense on the condensed consolidated statements of operations.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 11. Commitments and Contingencies 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 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) Resilience Threatened Litigation ​ In November 2020, we received a demand letter and draft complaint from counsel to Resilience Capital (“Resilience”) threatening to initiate a lawsuit against us in Delaware Chancery Court in connection with the February 2020 sale of SDI’s real property (the “Concord Property Sale”) located in Concord, California (the “Concord Real Property”) to Eagle Rock Holdings, LP (“Buyer”) and that certain Single-Tenant Triple Net Lease, dated as of February 10, 2020, entered into by and between SDI and the Buyer pursuant to which SDI leased from the Buyer the Concord Real Property for a term. In the demand, Resilience, among other things: (i) claimed that we received non-cash consideration in connection with the Concord Property Sale in the form of below-market rent; and (ii) asserted that litigation would be filed seeking, among other things, damages in an amount to be determined at trial, unless we promptly agreed to proceed with the appraisal process set forth in that certain Purchase and Sale Agreement, dated as of June 7, 2019, by and among the Company, The Resilience Fund IV, L.P., The Resilience Fund IV-A, L.P., Aerospace Newco Holdings, Inc. and Ember Acquisition Sub, Inc. To date no litigation has been filed and the parties have agreed to engage in mediation in an effort to resolve these claims. We believe that the claims made by Resilience are without merit and we intend to vigorously defend ourselves against them. ​

Equity

Equity	3 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Equity	NOTE 12. Equity Equity Plans We provide long-term incentives to eligible officers, directors, and employees in the form of equity-based awards. We maintain three equity incentive compensation plans, collectively described below as our “Equity Plans”: ● the 2010 Equity Incentive Plan, ● the 2012 Equity Incentive Plan, and ● the 2019 Equity Incentive Plan. We issue new shares of common stock to satisfy awards issued under our Equity Plans. Stock-based compensation The effect of recording stock-based compensation expense was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Stock-based Compensation Expense - by award type ​ ended December 31, (in thousands) 2020 2019 Employee stock options ​ $ 1 ​ $ 5 Restricted stock units and awards ​ 431 ​ 376 Performance stock units and awards ​ 317 ​ 292 Employee stock purchase plan ​ 89 ​ 47 Outside director equity awards and fees in common stock ​ 65 ​ 81 Total stock-based compensation expense ​ $ 903 ​ $ 801 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Stock-based Compensation Expense - by expense type ​ ended December 31, (in thousands) 2020 2019 Cost of revenue ​ $ 141 ​ $ 136 Selling, general, and administrative ​ 559 ​ 485 Research and development ​ 203 ​ 180 Total stock-based compensation expense ​ $ 903 ​ $ 801 ​ 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. During each of the three months ended December 31, 2020 and 2019, our matching contribution in cash was approximately $0.3 and $0.2 million, respectively. Income (Loss) Per Share The following table sets forth the computation of basic and diluted net income (loss) per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Basic and Diluted Net Income (Loss) Per Share ​ ended December 31, (in thousands, except per share) 2020 2019 Numerator: ​ ​ ​ ​ Income (Loss) from continuing operations ​ $ 2,569 ​ $ (1,335) Undistributed earnings allocated to common shareholders for basic and diluted net income (loss) per share ​ 2,569 ​ (1,335) Denominator: ​ ​ Denominator for basic net income (loss) per share - weighted average shares outstanding ​ 29,503 ​ 28,832 Denominator for fully diluted net (income) loss per share - weighted average shares outstanding ​ ​ 30,377 ​ ​ 28,832 ​ ​ ​ ​ ​ ​ ​ Net income (loss) per basic share ​ $ 0.09 ​ $ (0.05) Net income (loss) per fully diluted share ​ $ 0.08 ​ $ (0.05) ​ ​ ​ ​ ​ ​ ​ Weighted average antidilutive options, unvested restricted stock units and awards, unvested performance stock units and ESPP shares excluded from the computation ​ 874 ​ 1,168 ​ ​ ​ ​ ​ ​ ​ ​ Basic earnings per share is computed by dividing net income (loss) for the period by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income (loss) for the period by the weighted average number of common shares outstanding during the period, plus the dilutive effect of outstanding restricted stock units and awards, performance stock units, stock options, and shares issuable under the employee stock purchase plan as applicable pursuant to the treasury stock method. The anti-dilutive stock options and shares of outstanding and unvested restricted stock were excluded from the computation of net loss per share for the three months ended December 31, 2020 due to the Company incurring a net loss for the period. Employee Stock Purchase Plan We maintain an Employee Stock Purchase Plan (“ESPP”) which 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. Future Issuances As of December 31, 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 38,407 Unvested restricted stock units and awards 1,734,697 Unvested performance stock units and awards (at 200% maximum payout) 1,472,000 Purchases under the employee stock purchase plan 312,474 Issuance of stock-based awards under the Equity Plans 637,303 Purchases under the officer and director share purchase plan 88,741 Total reserved 4,283,622 ​

Segment Data and Related Inform

Segment Data and Related Information	3 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Data and Related Information	NOTE 13. Segment Data and Related Information 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. The Company has determined that it has two reportable segments, (i) Aerospace and Defense and (ii) Broadband. 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. The Aerospace and Defense segment is comprised of two product lines: (a) Navigation and Inertial Sensing; and (b) Defense Optoelectronics. The Broadband segment is comprised of three product lines: (a) CATV Lasers and Transmitters; (b) Chip Devices; and (c) Other. Information on reportable segments utilized by our chief operating decision maker is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months (in thousands) ​ ​ ended December 31, ​ ​ ​ 2020 ​ 2019 Revenue: ​ ​ ​ ​ ​ ​ Aerospace and Defense ​ $ 13,636 ​ $ 13,704 Broadband ​ ​ 19,790 ​ ​ 11,778 Total revenue ​ $ 33,426 ​ $ 25,482 ​ ​ ​ ​ ​ ​ ​ Segment Profit: ​ ​ ​ ​ ​ ​ Aerospace and Defense gross profit ​ $ 4,100 ​ $ 4,488 Aerospace & Defense R&D expense ​ ​ 3,686 ​ ​ 3,951 Aerospace and Defense segment profit ​ $ 414 ​ $ 537 ​ ​ ​ ​ ​ ​ ​ Broadband gross profit ​ $ 8,472 ​ $ 2,987 Broadband R&D expense ​ ​ 610 ​ ​ 692 Broadband segment profit ​ $ 7,862 ​ $ 2,295 ​ ​ ​ ​ ​ ​ ​ Total consolidated segment profit ​ $ 8,276 ​ $ 2,832 Unallocated expense: ​ ​ ​ ​ ​ ​ Selling, general and administrative ​ ​ 5,798 ​ ​ 5,887 Gain on sale of assets ​ ​ (29) ​ ​ (1,602) Interest expense, net ​ ​ 49 ​ ​ 15 Foreign exchange gain ​ ​ (237) ​ ​ (147) Total unallocated expense ​ ​ 5,581 ​ ​ 4,153 Income (loss) before income tax expense ​ $ 2,695 ​ $ (1,321) ​ Revenue : ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Revenue by Geographic Region ​ ended December 31, (in thousands) 2020 2019 United States and Canada ​ $ 29,346 ​ $ 20,195 Asia ​ 3,025 ​ 2,266 Europe ​ 656 ​ 1,889 Other ​ 399 ​ 1,132 Total revenue ​ $ 33,426 ​ $ 25,482 ​ Significant Customers Significant portions of the Company’s sales are concentrated among a limited number of customers. The duration, severity and future impact of the COVID-19 pandemic are highly uncertain and could result in significant disruptions to the business operations of the Company’s customers. If one or more of these significant customers significantly decreases their orders for the Company’s products, the Company’s business could be materially and adversely affected. Long-lived Assets

Description of Business (Accoun

Description of Business (Accounting Policies) (Policies)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Interim Financial Statements		Interim Financial Statements The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim information, and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X promulgated by the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by U.S. GAAP for annual financial statements. In our opinion, the interim financial statements reflect all adjustments, which are all normal recurring adjustments, that are necessary to provide a fair presentation of the financial results for the interim periods presented. Operating results for interim periods are not necessarily indicative of results that may be expected for an entire fiscal year. The condensed consolidated balance sheet as of September 30, 2020 has been derived from the audited consolidated financial statements as of such date. For a more complete understanding of our business, financial position, operating results, cash flows, risk factors and other matters, please refer to our Annual Report on Form 10-K for the fiscal year ended September 30, 2020.
Significant Accounting Policies and Estimates		Significant Accounting Policies and Estimates Our significant accounting policies are detailed in “Note 2 - Summary of Significant Accounting Policies” of our Annual Report on Form 10-K for the year ended September 30, 2020. There have been no significant changes to our accounting policies during the three months ended December 31, 2020. The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities, as of the date of the financial statements, and the reported amounts of revenue and expenses during the reported period. If these estimates differ significantly from actual results, the impact to the condensed consolidated financial statements may be material. There have been no material changes in our critical accounting policies and estimates from those disclosed in our Annual Report on Form 10-K for the fiscal year ended September 30, 2020. Please refer to Part II, Item 7 of our Annual Report on Form 10-K for the fiscal year ended September 30, 2020 for a discussion of our critical accounting policies and estimates.
New Accounting Updates Recently Adopted and Recent Accounting Standards or Updates Not Yet Effective		(a) New Accounting Updates Recently Adopted
Cash and Cash Equivalents	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	Restricted cash represents temporarily restricted deposits held as compensating balances against short-term borrowing arrangements.
Fair Value of Financial Instruments	Accounting Standards Codification Topic 820 (“ASC 820”), Fair Value Measurement, ● 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.
Revenue Recognition and Disaggregation of Revenue	Disaggregation of Revenue - Note 13 – Segment Data and Related Information Revenue is also classified by major product category and is presented below:
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. The Company has determined that it has two reportable segments, (i) Aerospace and Defense and (ii) Broadband. 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.

Description of Business (Tables

Description of Business (Tables)	3 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Disaggregation of Revenue [Table Text Block]	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended December 31, ​ ​ ​ ​ ​ % of ​ ​ ​ ​ % of (in thousands) 2020 Revenue 2019 Revenue Navigation and Inertial Sensing ​ $ 9,202 ​ 28 % $ 10,267 ​ 40 % Defense Optoelectronics ​ ​ 4,434 ​ 13 % ​ 3,437 ​ 13 % CATV Lasers and Transmitters ​ ​ 17,315 ​ 52 % ​ 9,383 ​ 37 % Chip Devices ​ 743 2 % ​ 1,555 6 % Other ​ 1,732 5 % ​ 840 4 % Total revenue ​ $ 33,426 100 % $ 25,482 100 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Cash, Cash Equivalents and Re_2

Cash, Cash Equivalents and Restricted Cash (Tables)	3 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of As of ​ ​ December 31, ​ September 30, ​ (in thousands) ​ 2020 ​ 2020 ​ Cash ​ $ 12,055 ​ $ 11,325 ​ Cash equivalents ​ ​ 19,065 ​ ​ 19,065 ​ Restricted cash ​ 38 ​ 148 ​ Total cash, cash equivalents and restricted cash ​ $ 31,158 ​ $ 30,538 ​

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The components of accounts receivable consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Accounts receivable, gross ​ $ 27,510 ​ $ 25,551 Allowance for credit loss ​ (234) ​ (227) Accounts receivable, net ​ $ 27,276 ​ $ 25,324

Inventory (Tables)

Inventory (Tables)	3 Months Ended
	Dec. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	The components of inventory consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Raw materials ​ $ 14,795 ​ $ 13,354 Work in-process ​ 8,780 ​ 8,381 Finished goods ​ 4,280 ​ 3,790 Inventory balance at end of period ​ $ 27,855 ​ $ 25,525

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	3 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The components of property, plant, and equipment, net consisted of the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Equipment ​ $ 36,074 ​ $ 35,218 Furniture and fixtures ​ 1,125 ​ 1,125 Computer hardware and software ​ 3,476 ​ 3,473 Leasehold improvements ​ 3,249 ​ 3,169 Construction in progress ​ 9,933 ​ 10,301 Property, plant, and equipment, gross ​ $ 53,857 ​ $ 53,286 Accumulated depreciation ​ (33,299) ​ (32,234) Property, plant, and equipment, net ​ $ 20,558 ​ $ 21,052

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	3 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Schedule of components of accrued expenses and other current liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of (in thousands) December 31, 2020 September 30, 2020 Compensation ​ $ 5,140 ​ $ 6,916 Warranty ​ 921 ​ 803 Legal expenses and other professional fees ​ ​ 210 ​ ​ 211 Contract liabilities ​ ​ 77 ​ ​ 502 Income and other taxes ​ 1,411 ​ 1,265 Severance and restructuring accruals ​ — ​ 17 Other ​ 1,891 ​ 1,863 Accrued expenses and other current liabilities ​ $ 9,650 ​ $ 11,577

Equity (Tables)

Equity (Tables)	3 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Schedule of Stock-based Compensation Expense - By Award Type	The effect of recording stock-based compensation expense was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Stock-based Compensation Expense - by award type ​ ended December 31, (in thousands) 2020 2019 Employee stock options ​ $ 1 ​ $ 5 Restricted stock units and awards ​ 431 ​ 376 Performance stock units and awards ​ 317 ​ 292 Employee stock purchase plan ​ 89 ​ 47 Outside director equity awards and fees in common stock ​ 65 ​ 81 Total stock-based compensation expense ​ $ 903 ​ $ 801
Schedule of Stock-based Compensation Expense - By Expense Type	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Stock-based Compensation Expense - by expense type ​ ended December 31, (in thousands) 2020 2019 Cost of revenue ​ $ 141 ​ $ 136 Selling, general, and administrative ​ 559 ​ 485 Research and development ​ 203 ​ 180 Total stock-based compensation expense ​ $ 903 ​ $ 801
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted net income (loss) per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Basic and Diluted Net Income (Loss) Per Share ​ ended December 31, (in thousands, except per share) 2020 2019 Numerator: ​ ​ ​ ​ Income (Loss) from continuing operations ​ $ 2,569 ​ $ (1,335) Undistributed earnings allocated to common shareholders for basic and diluted net income (loss) per share ​ 2,569 ​ (1,335) Denominator: ​ ​ Denominator for basic net income (loss) per share - weighted average shares outstanding ​ 29,503 ​ 28,832 Denominator for fully diluted net (income) loss per share - weighted average shares outstanding ​ ​ 30,377 ​ ​ 28,832 ​ ​ ​ ​ ​ ​ ​ Net income (loss) per basic share ​ $ 0.09 ​ $ (0.05) Net income (loss) per fully diluted share ​ $ 0.08 ​ $ (0.05) ​ ​ ​ ​ ​ ​ ​ Weighted average antidilutive options, unvested restricted stock units and awards, unvested performance stock units and ESPP shares excluded from the computation ​ 874 ​ 1,168 ​ ​ ​ ​ ​ ​ ​
Schedule of Common Stock Reserved for Future Issuances	As of December 31, 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 38,407 Unvested restricted stock units and awards 1,734,697 Unvested performance stock units and awards (at 200% maximum payout) 1,472,000 Purchases under the employee stock purchase plan 312,474 Issuance of stock-based awards under the Equity Plans 637,303 Purchases under the officer and director share purchase plan 88,741 Total reserved 4,283,622

Segment Data and Related Info_2

Segment Data and Related Information (Tables)	3 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Schedule of Reportable Segment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months (in thousands) ​ ​ ended December 31, ​ ​ ​ 2020 ​ 2019 Revenue: ​ ​ ​ ​ ​ ​ Aerospace and Defense ​ $ 13,636 ​ $ 13,704 Broadband ​ ​ 19,790 ​ ​ 11,778 Total revenue ​ $ 33,426 ​ $ 25,482 ​ ​ ​ ​ ​ ​ ​ Segment Profit: ​ ​ ​ ​ ​ ​ Aerospace and Defense gross profit ​ $ 4,100 ​ $ 4,488 Aerospace & Defense R&D expense ​ ​ 3,686 ​ ​ 3,951 Aerospace and Defense segment profit ​ $ 414 ​ $ 537 ​ ​ ​ ​ ​ ​ ​ Broadband gross profit ​ $ 8,472 ​ $ 2,987 Broadband R&D expense ​ ​ 610 ​ ​ 692 Broadband segment profit ​ $ 7,862 ​ $ 2,295 ​ ​ ​ ​ ​ ​ ​ Total consolidated segment profit ​ $ 8,276 ​ $ 2,832 Unallocated expense: ​ ​ ​ ​ ​ ​ Selling, general and administrative ​ ​ 5,798 ​ ​ 5,887 Gain on sale of assets ​ ​ (29) ​ ​ (1,602) Interest expense, net ​ ​ 49 ​ ​ 15 Foreign exchange gain ​ ​ (237) ​ ​ (147) Total unallocated expense ​ ​ 5,581 ​ ​ 4,153 Income (loss) before income tax expense ​ $ 2,695 ​ $ (1,321)
Schedule of Revenue by Geographic Region	​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months Revenue by Geographic Region ​ ended December 31, (in thousands) 2020 2019 United States and Canada ​ $ 29,346 ​ $ 20,195 Asia ​ 3,025 ​ 2,266 Europe ​ 656 ​ 1,889 Other ​ 399 ​ 1,132 Total revenue ​ $ 33,426 ​ $ 25,482

Description of Business (Revenu

Description of Business (Revenue by Product) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 33,426	$ 25,482
Concentration risk percentage	100.00%	100.00%
Navigation And Inertial Sensing
Disaggregation of Revenue [Line Items]
Revenue	$ 9,202	$ 10,267
Concentration risk percentage	28.00%	40.00%
Defense Optoelectronics
Disaggregation of Revenue [Line Items]
Revenue	$ 4,434	$ 3,437
Concentration risk percentage	13.00%	13.00%
CA TV Lasers And Transmitters
Disaggregation of Revenue [Line Items]
Revenue	$ 17,315	$ 9,383
Concentration risk percentage	52.00%	37.00%
Chip Devices
Disaggregation of Revenue [Line Items]
Revenue	$ 743	$ 1,555
Concentration risk percentage	2.00%	6.00%
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 1,732	$ 840
Concentration risk percentage	5.00%	4.00%

Cash, Cash Equivalents and Re_3

Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Cash and Cash Equivalents [Abstract]
Cash	$ 12,055	$ 11,325
Cash equivalents	19,065	19,065
Restricted cash	38	148
Total cash, cash equivalents and restricted cash	$ 31,158	$ 30,538

Accounts Receivable (Schedule o

Accounts Receivable (Schedule of Components of Accounts Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Receivables [Abstract]
Accounts receivable, gross	$ 27,510	$ 25,551
Allowance for doubtful accounts	(234)	(227)
Accounts receivable, net	$ 27,276	$ 25,324

Inventory (Schedule of Componen

Inventory (Schedule of Components of Inventory) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 14,795	$ 13,354
Work in-process	8,780	8,381
Finished goods	4,280	3,790
Inventory balance at end of period	$ 27,855	$ 25,525

Property, Plant, and Equipmen_3

Property, Plant, and Equipment, net (Schedule of Property, Plant, and Equipment) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 53,857,000		$ 53,286,000
Accumulated depreciation	(33,299,000)		(32,234,000)
Property, plant, and equipment, net	20,558,000		21,052,000
Gain on sale of equipment	29,000	$ 1,600,000
Equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	36,074,000		35,218,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	1,125,000		1,125,000
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,476,000		3,473,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	3,249,000		3,169,000
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 9,933,000		$ 10,301,000

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities (Schedule of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Payables and Accruals [Abstract]
Compensation	$ 5,140	$ 6,916
Warranty	921	803
Legal expenses and other professional fees	210	211
Contract liabilities	77	502
Income and other taxes	1,411	1,265
Severance and restructuring accruals		17
Other	1,891	1,863
Accrued expenses and other current liabilities	$ 9,650	$ 11,577

Credit Facilities and Debt (Nar

Credit Facilities and Debt (Narrative) (Details) $ in Thousands	May 06, 2020USD ($)	Dec. 31, 2021USD ($)LetterOfCredit	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)
Line of Credit Facility [Line Items]
Paycheck Protection Program Liability, Current			$ 1,093
Paycheck Protection Program Liability, Noncurrent			5,395	$ 6,488
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term line of credit		$ 0
Standby letters of credit, total amount outstanding		500
Remaining borrowing capacity		$ 3,500
Revolving Credit Facility | LIBOR Rate Loan
Line of Credit Facility [Line Items]
Number of standby letters of credit outstanding | LetterOfCredit		1
Revolving Credit Facility | Minimum
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
Revolving Credit Facility | Maximum | Tenth Amendment
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 15,000
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 (Narrati

Income and Other Taxes (Narrative) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income tax (expense) benefit	$ 126,000	$ 14,000
Effective tax rate on continuing operations	0.40%	0.00%
Interest and penalties accrued as tax liabilities	$ 600,000		$ 600,000
Uncertain tax benefit	$ 400,000

Commitments and Contingencies (

Commitments and Contingencies (Details)	Nov. 30, 2020
Resilience Threatened Litigation [Member] | Concord Property [Member]
Loss Contingencies [Line Items]
Lease length in years	15 years

Equity (Schedule of Stock-based

Equity (Schedule of Stock-based Compensation Expense - by Award Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 903	$ 801
Employee stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1	5
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	431	376
Performance stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	317	292
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	89	47
Outside director equity awards and fees in common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 65	$ 81

Equity (Schedule of Stock-bas_2

Equity (Schedule of Stock-based Compensation Expense - by Expense Category) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 903	$ 801
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	141	136
Selling, general, and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	559	485
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 203	$ 180

Equity (401k) (Details)

Equity (401k) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Matching contribution	$ 0.3	$ 0.2

Equity (Schedule of Earnings pe

Equity (Schedule of Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Income (Loss) from continuing operations	$ 2,569	$ (1,335)
Undistributed earnings allocated to common shareholders for basic and diluted net income (loss) per share	$ 2,569	$ (1,335)
Denominator for basic net income (loss) per share - weighted average shares outstanding	29,503	28,832
Denominator for fully diluted net (income) loss per share - weighted average shares outstanding	30,377	28,832
Net income (loss) per basic share	$ 0.09	$ (0.05)
Net income (loss) per diluted share	$ 0.08	$ (0.05)
Weighted average antidilutive options, unvested restricted stock units and awards, unvested performance stock units and ESPP shares excluded from the computation	874	1,168

Equity (Employee Stock Purchase

Equity (Employee Stock Purchase Plan) (Details) - Employee stock purchase plan	3 Months Ended
	Dec. 31, 2020USD ($)
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

Equity (Schedule of Common Stoc

Equity (Schedule of Common Stock Reserved for Future Issuances) (Details)	Dec. 31, 2020shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of outstanding stock options (in shares)	38,407
Purchases under the employee stock purchase plan (in shares)	312,474
Issuance of stock-based awards under the Equity Plans (in shares)	637,303
Purchases under the officer and director share purchase plan (in shares)	88,741
Total reserved (in shares)	4,283,622
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested stock units (in shares)	1,734,697
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested award potential, percentage	200.00%
Unvested performance stock units (in shares)	1,472,000

Equity (Narrative) (Details)

Equity (Narrative) (Details)	Dec. 31, 2020plan
Equity [Abstract]
Number of equity incentive compensation plans maintained by the company	3

Segment Data and Related Info_3

Segment Data and Related Information (Schedule of Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 33,426	$ 25,482
Gross profit	12,572	7,474
R&D expense	4,296	4,642
Operating income (loss)	2,507	(1,453)
Unallocated (income) expense:
Selling, general, and administrative	5,798	5,887
Gain on sale of assets	(29)	(1,602)
Interest expense, net	49	15
Foreign exchange gain	(237)	(147)
Total unallocated expense	5,581	4,153
Income (loss) before income tax expense	2,695	(1,321)
Operating segments
Segment Reporting Information [Line Items]
Revenue	33,426	25,482
Operating income (loss)	8,276	2,832
Operating segments | Aerospace And Defense
Segment Reporting Information [Line Items]
Revenue	13,636	13,704
Gross profit	4,100	4,488
R&D expense	3,686	3,951
Operating income (loss)	414	537
Operating segments | Broadband
Segment Reporting Information [Line Items]
Revenue	19,790	11,778
Gross profit	8,472	2,987
R&D expense	610	692
Operating income (loss)	$ 7,862	$ 2,295

Segment Data and Related Info_4

Segment Data and Related Information (Schedule of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Segment revenue	$ 33,426	$ 25,482
United States and Canada
Segment Reporting Information [Line Items]
Segment revenue	29,346	20,195
Asia
Segment Reporting Information [Line Items]
Segment revenue	3,025	2,266
Europe
Segment Reporting Information [Line Items]
Segment revenue	656	1,889
Other
Segment Reporting Information [Line Items]
Segment revenue	$ 399	$ 1,132

Segment Data and Related Info_5

Segment Data and Related Information (Narrative) (Details)	3 Months Ended
	Dec. 31, 2020customersegment	Dec. 31, 2019customer	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of reporting segments | segment	2
Concentration risk percentage	100.00%	100.00%
Percentage of long-lived assets located in the United States	98.00%		97.00%
Customer Concentration Risk
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Concentration risk, customers | customer	3	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	70.00%	50.00%