Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Activities:
Net loss	$ (2,812)	$ (274)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,376	1,860
Stock-based compensation	1,680	1,433
Noncash lease expense	91	74
Provision for credit losses	4	(7)
Deferred taxes	(640)	310
Other	77	13
Change in operating assets and liabilities:
Accounts receivable and contract assets	1,547	(830)
Inventories	(1,570)	(236)
Prepaids and other	(1,432)	(357)
Accounts payable	200	(485)
Accrued liabilities	(5,227)	(4,236)
Income taxes	(95)	(165)
Deferred revenue	(1,225)	(1,370)
Net cash used in operating activities	(7,026)	(4,270)
Investing Activities:
Purchases of property and equipment	(782)	(1,319)
Payment for acquisition of intangible assets		(1,000)
Purchases of available-for-sale securities		(5,820)
Maturities of available-for-sale securities	4,000	18,013
Net cash provided by investing activities	3,218	9,874
Financing Activities:
Issuance of common stock	230	6
Payments for taxes related to net share settlement of equity awards	(853)	(646)
Payments for acquisition of in-process research and development		(150)
Net cash used in financing activities	(623)	(790)
Effect of exchange rate changes on cash	(72)	155
Net change in cash and cash equivalents	(4,503)	4,969
Cash and Cash Equivalents:
Beginning of period	31,153	30,785
End of period	26,650	35,754
Supplemental Information:
Cash paid for income taxes	3	9
Cash paid for interest	82
Noncash investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities	137	82
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 350	$ 44