CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income	$ 6,171	$ 2,816
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	8,582	7,112
Amortization of intangible assets	5,241	4,786
Depreciation and amortization	1,120	1,143
Amortization of investment premiums & other	774	(3)
Accretion and amortization on debt securities	3,080	0
Net changes in estimated fair value of acquisition-related contingent consideration	0	98
Deferred taxes	(263)	748
Changes in assets and liabilities:
Accounts receivable	(2,681)	2,109
Contract assets	2,326	(4,802)
Other assets	(1,468)	(175)
Accounts payable	(1,397)	724
Accrued payroll and related taxes	428	919
Deferred revenue	2,928	3,947
Restructuring accrual	0	(1,324)
Other liabilities	175	(723)
Net cash provided by operating activities	25,016	17,375
Investing activities:
Purchases of investments	(186,444)	(32,282)
Sales and maturities of investments	52,536	17,272
Acquisitions, net of cash acquired	(12,549)	0
Purchases of property and equipment	(966)	(520)
Net cash used in investing activities	(147,423)	(15,530)
Financing activities:
Proceeds from the issuance of convertible senior notes	155,250	0
Payment for convertible senior notes issuance costs	(5,513)	0
Purchase of 2026 convertible senior notes hedge	(33,192)	0
Proceeds from issuance of convertible senior notes warrants	23,909	0
Proceeds from the issuance of equity plan common stock	2,992	1,644
Repurchases and retirements of common stock	0	(1,002)
Payment of acquisition-related contingent consideration	(783)	(478)
Proceeds from other borrowings	251	217
Principal payments on other borrowings	(68)	(121)
Net cash provided by financing activities	142,846	260
Foreign currency effect on cash and cash equivalents	124	85
Net increase in cash and cash equivalents	20,563	2,190
Cash and cash equivalents at beginning of period	19,986	16,748
Cash and cash equivalents at end of period	40,549	18,938
Supplemental disclosures of cash flow information:
Cash paid for income taxes	556	0
Supplemental disclosures of non-cash investing and financing activities:
Unrealized holding gain (loss) on available for sale investments	$ (175)	$ 156