Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net income	$ 7,813	$ 1,610
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,766	3,600
Stock-based compensation	2,862	2,697
Payment of contingent consideration obligations in excess of acquisition-date value		(608)
Deferred taxes	808	1,388
Loss on strategic investment		479
Provision for credit losses	(12)	137
Other	170	108
Change in operating assets and liabilities:
Accounts receivable and contract asset	(1,908)	1,914
Inventories	(349)	(1,233)
Prepaids and other	(409)	(622)
Accounts payable	(303)	(128)
Accrued liabilities	(2,705)	(1,826)
Income taxes	739	(3,615)
Deferred revenue	1,273	(2,644)
Net cash provided by operating activities	11,745	1,257
Investing Activities:
Purchases of property and equipment	(1,973)	(2,311)
Payment for acquisition of intangible assets	(1,000)
Purchases of available-for-sale securities	(22,875)	(35,863)
Maturities of available-for-sale securities	31,318	27,425
Net cash provided by (used in) investing activities	5,470	(10,749)
Financing Activities:
Issuance of common stock	2,536	318
Payments for taxes related to net share settlement of equity awards	(2,243)	(2,373)
Payment of contingent consideration obligations		(2,592)
Payments for acquisition of in-process research and development	(150)	(1,000)
Net cash provided by (used in) financing activities	143	(5,647)
Effect of exchange rate changes on cash	16	(14)
Net change in cash and cash equivalents	17,374	(15,153)
Cash and Cash Equivalents:
Beginning of period	30,785	30,361
End of period	48,159	15,208
Supplemental Information:
Cash paid for income taxes	16	6
Noncash investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities	641	87
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 44	$ 597