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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Operating activities:      
Net income $ 7,978 $ 7,814 $ (724)
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation expense 11,532 9,551 9,637
Amortization of intangible assets 7,505 6,439 7,024
Depreciation and amortization 1,439 1,504 1,388
Amortization of investment premiums & other 1,266 63 (134)
Accretion and amortization on debt securities 4,372 0 0
Net changes in estimated fair value of acquisition-related contingent consideration 1,080 136 472
Deferred taxes 105 1,903 (3,775)
Changes in assets and liabilities:      
Accounts receivable (813) (361) 1,564
Contract assets 1,150 (6,695) (1,757)
Other assets (1,331) 173 (769)
Accounts payable (1,589) 277 28
Accrued payroll and related taxes 2,687 2,343 (1,529)
Deferred revenue 1,790 3,141 1,125
Restructuring accrual 0 (1,562) 1,573
Other liabilities 170 (604) 127
Net cash provided by operating activities 37,341 24,122 14,250
Investing activities:      
Purchases of investments (246,508) (44,725) (24,410)
Sales and maturities of investments 89,956 20,822 14,966
Acquisitions, net of cash acquired (12,549) 0 0
Purchases of property and equipment (1,387) (803) (1,063)
Net cash used in investing activities (170,488) (24,706) (10,507)
Financing activities:      
Proceeds from the issuance of convertible senior notes 155,250 0 0
Payment for convertible senior notes issuance costs (5,513) 0 0
Purchase of 2026 convertible senior notes hedge (33,192) 0 0
Proceeds from issuance of convertible senior notes warrants 23,909 0 0
Proceeds from the issuance of equity plan common stock 4,035 4,809 5,581
Repurchases and retirements of common stock (190) (1,002) 0
Payment of acquisition-related contingent consideration (782) (478) (1,030)
Proceeds from other borrowings 251 217 128
Principal payments on other borrowings (88) (143) (296)
Net cash provided by financing activities 143,680 3,403 4,383
Foreign currency effect on cash and cash equivalents (207) 419 (406)
Net increase in cash and cash equivalents 10,326 3,238 7,720
Cash and cash equivalents at beginning of period 19,986 16,748 9,028
Cash and cash equivalents at end of period 30,312 19,986 16,748
Supplemental disclosures of cash flow information:      
Cash paid for interest 569 0 0
Cash paid for income taxes 741 (451) 310
Supplemental disclosures of non-cash investing and financing activities:      
Unrealized holding gain (loss) on available-for-sale investments $ (165) $ 103 $ 29