Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities:
Net income	$ 4,526	$ 4,069
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,610	5,390
Stock-based compensation	4,318	4,037
Payment of contingent consideration obligations in excess of acquisition-date value		(608)
Deferred taxes	947	592
Loss on strategic investment		479
Provision for credit losses	(11)	30
Other	260	176
Change in operating assets and liabilities:
Accounts receivable and contract asset	(1,809)	4,303
Inventories	(338)	(1,333)
Prepaids and other	(59)	(432)
Accounts payable	(27)	(489)
Accrued liabilities	(435)	116
Income taxes	1,327	(4,105)
Deferred revenue	191	471
Net cash provided by operating activities	14,500	12,696
Investing Activities:
Purchases of property and equipment	(2,874)	(2,627)
Payment for acquisition of intangible assets	(1,000)
Purchases of available-for-sale securities	(22,799)	(45,766)
Maturities of available-for-sale securities	43,317	46,522
Net cash provided by (used in) investing activities	16,644	(1,871)
Financing Activities:
Issuance of common stock	2,627	1,169
Payments for taxes related to net share settlement of equity awards	(2,279)	(2,385)
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	198	(4,808)
Effect of exchange rate changes on cash	50	8
Net change in cash and cash equivalents	31,392	6,025
Cash and Cash Equivalents:
Beginning of period	30,785	30,361
End of period	62,177	36,386
Supplemental Information:
Cash paid for income taxes	35	9
Noncash investing and financing activities:
Acquisition of property and equipment, net of refundable credits in other current assets and liabilities	345	395
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 234	$ 1,012