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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities:    
Net income $ 9,899 $ 3,559
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation expense 5,146 6,429
Amortization of intangible assets 9,007 4,525
Depreciation and amortization 767 555
Amortization of investment premiums & other (26) 1,109
Accretion and amortization on debt securities 3,700 3,453
Net changes in estimated fair value of acquisition-related contingent consideration 150 (1,370)
Deferred taxes (6,827) (763)
Changes in assets and liabilities, net of acquisitions:    
Accounts receivable (7,379) (6,095)
Contract assets (4,969) 345
Other assets (753) 450
Accounts payable 367 3,769
Accrued payroll and related taxes (2,724) (4,693)
Income taxes payable [1] 8,672 155
Deferred revenue (2,429) (2,215)
Restructuring accrual (956) 0
Other liabilities [1] (84) 473
Net cash provided by operating activities 11,561 9,686
Investing activities:    
Purchases of investments 0 (47,818)
Sales and maturities of investments 38,100 173,316
Acquisitions, net of cash acquired 0 (126,607)
Purchases of property and equipment, net (372) (634)
Net cash provided by (used in) investing activities 37,728 (1,743)
Financing activities:    
Proceeds from the issuance of equity plan common stock 1,295 1,128
Repurchases and retirements of common stock 0 (14,828)
Principal payments on other borrowings (36) (36)
Net cash provided by (used in) financing activities 1,259 (13,736)
Foreign currency effect on cash and cash equivalents 440 (535)
Net increase (decrease) in cash and cash equivalents 50,988 (6,328)
Cash and cash equivalents at beginning of period 32,059 30,312
Cash and cash equivalents at end of period 83,047 23,984
Supplemental disclosures of cash flow information:    
Cash paid for interest 602 582
Cash paid for income taxes 2,057 597
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 42,821
Unrealized holding gain (loss) on available for sale investments $ 648 $ (1,098)
[1] March 31, 2022 condensed consolidated statement of cash flows reflects reclassifications to conform to the current year presentation.