CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Operating activities:
Net income	$ 8,027	$ 3,694	$ 7,978
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	10,463	13,346	11,532
Amortization of intangible assets	16,992	13,547	7,505
Depreciation and amortization	1,727	1,401	1,439
Amortization of investment premiums & other	(722)	1,684	1,266
Accretion and amortization on debt securities	7,546	7,053	4,372
Net changes in estimated fair value of acquisition-related contingent consideration	2,056	(1,358)	1,080
Deferred taxes	(5,496)	(8,988)	105
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	4,316	(19,004)	(813)
Contract assets	(12,471)	(3,095)	1,150
Other assets	(1,124)	417	(1,331)
Accounts payable	2,535	2,183	(1,589)
Accrued payroll and related taxes	18	(2,195)	2,687
Income taxes payable	5,577	422	(71)
Deferred revenue	(5,217)	9,950	1,790
Restructuring accrual	(977)	991	0
Other liabilities	(1,664)	1,071	241
Net cash provided by operating activities	31,586	21,119	37,341
Investing activities:
Purchases of investments	(71,733)	(47,818)	(246,508)
Sales and maturities of investments	66,250	173,316	89,956
Acquisitions, net of cash acquired	(267)	(122,672)	(12,549)
Purchases of property and equipment, net	(1,034)	(1,126)	(1,387)
Net cash provided by (used in) investing activities	(6,784)	1,700	(170,488)
Financing activities:
Proceeds from the issuance of convertible senior notes	0	0	155,250
Payment for convertible senior notes issuance costs	0	0	(5,513)
Purchase of 2026 convertible senior notes hedge	0	0	(33,192)
Proceeds from issuance of convertible senior notes warrants	0	0	23,909
Proceeds from the issuance of equity plan common stock	1,737	1,725	4,035
Repurchases and retirements of common stock	0	(15,176)	(190)
Payment of acquisition-related contingent consideration	0	(7,656)	(782)
Proceeds from other borrowings	0	0	251
Principal payments on other borrowings	(36)	(36)	(88)
Net cash provided by (used in) financing activities	1,701	(21,143)	143,680
Foreign currency effect on cash and cash equivalents	351	71	(207)
Net increase in cash and cash equivalents	26,854	1,747	10,326
Cash and cash equivalents at beginning of period	32,059	30,312	19,986
Cash and cash equivalents at end of period	58,913	32,059	30,312
Supplemental disclosures of cash flow information:
Cash paid for interest	1,413	1,164	569
Cash paid for income taxes	3,836	750	741
Supplemental disclosures of non-cash investing and financing activities:
Reclassification of convertible senior notes hedge and embedded conversion derivative to additional paid-in capital	0	28,516	0
Acquisition-related shares issued	0	1,836	0
Unrealized holding gain (loss) on available-for-sale investments	$ 889	$ 283	$ (165)