Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net (loss) income	$ (6,895)	$ 7,813
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	4,696	3,766
Stock-based compensation	3,399	2,862
Noncash lease expense	209	146
Provision for credit losses	4	(12)
Deferred taxes	(1,577)	808
Other	207	24
Change in operating assets and liabilities:
Accounts receivable and contract assets	(2,097)	(1,908)
Inventories	(2,711)	(349)
Prepaids and other	(1,899)	(409)
Accounts payable	487	(303)
Accrued liabilities	(2,035)	(2,705)
Income taxes	(508)	739
Deferred revenue	(2,506)	1,273
Net cash (used in) provided by operating activities	(11,226)	11,745
Investing Activities:
Purchases of property and equipment	(1,937)	(1,973)
Payment for acquisition of intangible assets		(1,000)
Purchases of available-for-sale securities		(22,875)
Maturities of available-for-sale securities	7,600	31,318
Net cash provided by investing activities	5,663	5,470
Financing Activities:
Issuance of common stock	741	2,536
Payments for taxes related to net share settlement of equity awards	(901)	(2,243)
Payments for acquisition of in-process research and development	(500)	(150)
Net cash (used in) provided by financing activities	(660)	143
Effect of exchange rate changes on cash	(218)	16
Net change in cash and cash equivalents	(6,441)	17,374
Cash and Cash Equivalents:
Beginning of period	31,153	30,785
End of period	24,712	48,159
Supplemental Information:
Cash paid for income taxes	392	16
Cash paid for interest	163
Noncash investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities	105	641
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,620	$ 44