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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net income $ 3,186 $ 1,468
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation expense 5,715 4,611
Amortization of intangible assets 3,352 3,187
Depreciation and amortization 774 749
Amortization of investment premiums & other 315 (39)
Accretion and amortization on debt securities 1,147 0
Deferred taxes (464) 474
Changes in assets and liabilities:    
Accounts receivable 1,444 1,240
Contract assets 2,177 (3,570)
Other assets (1,474) 242
Accounts payable (1,047) (635)
Accrued payroll and related taxes (1,305) (849)
Deferred revenue 2,379 3,623
Restructuring accrual 0 (1,208)
Other liabilities (138) (924)
Net cash provided by operating activities 16,061 8,369
Investing activities:    
Purchases of investments (147,524) (19,113)
Sales and maturities of investments 23,441 11,700
Purchases of property and equipment (660) (422)
Net cash used in investing activities (124,743) (7,835)
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 2,751 1,251
Repurchases and retirements of common stock 0 (1,002)
Payment of acquisition-related contingent consideration (782) (478)
Proceeds from other borrowings 251 0
Principal payments on other borrowings (39) (96)
Net cash provided by (used in) financing activities 142,635 (325)
Foreign currency effect on cash and cash equivalents (4) (29)
Net increase in cash and cash equivalents 33,949 180
Cash and cash equivalents at beginning of period 19,986 16,748
Cash and cash equivalents at end of period 53,935 16,928
Supplemental disclosures of cash flow information:    
Cash paid for income taxes 373 0
Supplemental disclosures of non-cash investing and financing activities:    
Unrealized holding gain (loss) on available for sale investments $ (186) $ 58