Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net (loss) income	$ (274)	$ 148
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	1,860	1,804
Stock-based compensation	1,433	1,393
Payment of contingent consideration obligations in excess of acquisition-date value		(608)
Deferred taxes	310	(194)
Provision for credit losses	(7)	(27)
Other	87	50
Change in operating assets and liabilities:
Accounts receivable and contract asset	(830)	1,726
Inventories	(236)	(413)
Prepaids and other	(357)	(800)
Accounts payable	(485)	529
Accrued liabilities	(4,236)	(3,112)
Income taxes	(165)	(59)
Deferred revenue	(1,370)	(1,346)
Net cash used in operating activities	(4,270)	(909)
Investing Activities:
Purchases of property and equipment	(1,319)	(1,671)
Payment for acquisition of intangible assets	(1,000)
Purchases of available-for-sale securities	(5,820)	(21,758)
Maturities of available-for-sale securities	18,013	7,425
Net cash provided by (used in) investing activities	9,874	(16,004)
Financing Activities:
Issuance of common stock	6	91
Payments for taxes related to net share settlement of equity awards	(646)	(1,964)
Payment of contingent consideration obligations		(2,592)
Payments for acquisition of in-process research and development	(150)
Net cash used in financing activities	(790)	(4,465)
Effect of exchange rate changes on cash	155	23
Net change in cash and cash equivalents	4,969	(21,355)
Cash and Cash Equivalents:
Beginning of period	30,785	30,361
End of period	35,754	9,006
Supplemental Information:
Cash paid for income taxes	9	4
Noncash investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities	82	$ 167
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 44