CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ 3,032	$ 7,978	$ 7,814
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	13,346	11,532	9,551
Amortization of intangible assets	13,547	7,505	6,439
Depreciation and amortization	1,401	1,439	1,504
Amortization of investment premiums & other	1,684	1,266	63
Accretion and amortization on debt securities	7,053	4,372	0
Net changes in estimated fair value of acquisition-related contingent consideration	(1,358)	1,080	136
Deferred taxes	(3,893)	105	1,903
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(10,813)	(813)	(361)
Contract assets	(2,330)	1,150	(6,695)
Other assets	363	(1,331)	173
Accounts payable	2,183	(1,589)	277
Accrued payroll and related taxes	(2,195)	2,687	2,343
Deferred revenue	1,850	1,790	3,141
Restructuring accrual	991	0	(1,562)
Other liabilities	1,490	170	(604)
Net cash provided by operating activities	26,351	37,341	24,122
Investing activities:
Purchases of investments	(47,818)	(246,508)	(44,725)
Sales and maturities of investments	173,316	89,956	20,822
Acquisitions, net of cash acquired	(127,902)	(12,549)	0
Purchases of property and equipment	(1,126)	(1,387)	(803)
Net cash used in investing activities	(3,530)	(170,488)	(24,706)
Financing activities:
Proceeds from the issuance of convertible senior notes	0	155,250	0
Payment for convertible senior notes issuance costs	0	(5,513)	0
Purchase of 2026 convertible senior notes hedge	0	(33,192)	0
Proceeds from issuance of convertible senior notes warrants	0	23,909	0
Proceeds from the issuance of equity plan common stock	1,725	4,035	4,809
Repurchases and retirements of common stock	(15,176)	(190)	(1,002)
Payment of acquisition-related contingent consideration	(7,656)	(782)	(478)
Proceeds from other borrowings	0	251	217
Principal payments on other borrowings	(36)	(88)	(143)
Net cash provided by (used in) financing activities	(21,143)	143,680	3,403
Foreign currency effect on cash and cash equivalents	69	(207)	419
Net increase in cash and cash equivalents	1,747	10,326	3,238
Cash and cash equivalents at beginning of period	30,312	19,986	16,748
Cash and cash equivalents at end of period	32,059	30,312	19,986
Supplemental disclosures of cash flow information:
Cash paid for interest	1,164	569	0
Cash paid for income taxes	750	741	(451)
Supplemental disclosures of non-cash investing and financing activities:
Reclassification of convertible senior notes hedge and embedded conversion derivative to additional paid-in capital	28,516	0	0
Acquisition-related shares issued	1,836	0	0
Unrealized holding gain (loss) on available-for-sale investments	$ 283	$ (165)	$ 103