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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net income $ 4,948 $ 6,171
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 10,117 8,582
Amortization of intangible assets 9,176 5,241
Depreciation and amortization 1,064 1,120
Amortization of investment premiums & other 1,348 774
Accretion and amortization on debt securities 5,239 3,080
Net changes in estimated fair value of acquisition-related contingent consideration (2,198) 0
Deferred taxes (1,141) (263)
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable (12,298) (2,681)
Contract assets (1,737) 2,326
Other assets (1,090) (1,468)
Accounts payable 1,147 (1,397)
Accrued payroll and related taxes (2,643) 428
Deferred revenue 1,077 2,928
Restructuring accrual 1,900 0
Other liabilities 1,104 175
Net cash provided by operating activities 16,013 25,016
Investing activities:    
Purchases of investments (47,818) (186,444)
Sales and maturities of investments 173,198 52,536
Acquisitions, net of cash acquired (126,607) (12,549)
Purchases of property and equipment (929) (966)
Net cash used in investing activities (2,156) (147,423)
Financing activities:    
Proceeds from the issuance of convertible senior notes 0 155,250
Payment for convertible senior notes issuance costs 0 (5,513)
Purchase of 2026 convertible senior notes hedge 0 (33,192)
Proceeds from issuance of convertible senior notes warrants 0 23,909
Proceeds from the issuance of equity plan common stock 1,162 2,992
Repurchases and retirements of common stock (14,828) 0
Payment of acquisition-related contingent consideration (6,770) (783)
Loans made to non-executive employees (1,041) 0
Proceeds from other borrowings 0 251
Principal payments on other borrowings (36) (68)
Net cash provided by (used in) financing activities (21,513) 142,846
Foreign currency effect on cash and cash equivalents (1,113) 124
Net increase (decrease) in cash and cash equivalents (8,769) 20,563
Cash and cash equivalents at beginning of period 30,312 19,986
Cash and cash equivalents at end of period 21,543 40,549
Supplemental disclosures of cash flow information:    
Issuance of common stock for acquisition-related contingent consideration 2,722 0
Cash paid for interest 597 0
Cash paid for income taxes 819 556
Supplemental disclosures of non-cash investing and financing activities:    
Reclassification of convertible senior notes hedge and embedded conversion derivative to additional paid-in capital 42,821 0
Unrealized holding loss on available for sale investments $ (189) $ (175)