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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Operating activities: |  |  |
Net income | $ 8,027 | $ 3,694 | $ 7,978
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation expense | 10,463 | 13,346 | 11,532
Amortization of intangible assets | 16,992 | 13,547 | 7,505
Depreciation and amortization | 1,727 | 1,401 | 1,439
Amortization of investment premiums & other | (722) | 1,684 | 1,266
Accretion and amortization on debt securities | 7,546 | 7,053 | 4,372
Net changes in estimated fair value of acquisition-related contingent consideration | 2,056 | (1,358) | 1,080
Deferred taxes | (5,496) | (8,988) | 105
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | 4,316 | (19,004) | (813)
Contract assets | (12,471) | (3,095) | 1,150
Other assets | (1,124) | 417 | (1,331)
Accounts payable | 2,535 | 2,183 | (1,589)
Accrued payroll and related taxes | 18 | (2,195) | 2,687
Income taxes payable | 5,577 | 422 | (71)
Deferred revenue | (5,217) | 9,950 | 1,790
Restructuring accrual | (977) | 991 | 0
Other liabilities | (1,664) | 1,071 | 241
Net cash provided by operating activities | 31,586 | 21,119 | 37,341
Investing activities: |  |  |
Purchases of investments | (71,733) | (47,818) | (246,508)
Sales and maturities of investments | 66,250 | 173,316 | 89,956
Acquisitions, net of cash acquired | (267) | (122,672) | (12,549)
Purchases of property and equipment, net | (1,034) | (1,126) | (1,387)
Net cash provided by (used in) investing activities | (6,784) | 1,700 | (170,488)
Financing activities: |  |  |
Proceeds from the issuance of convertible senior notes | 0 | 0 | 155,250
Payment for convertible senior notes issuance costs | 0 | 0 | (5,513)
Purchase of 2026 convertible senior notes hedge | 0 | 0 | (33,192)
Proceeds from issuance of convertible senior notes warrants | 0 | 0 | 23,909
Proceeds from the issuance of equity plan common stock | 1,737 | 1,725 | 4,035
Repurchases and retirements of common stock | 0 | (15,176) | (190)
Payment of acquisition-related contingent consideration | 0 | (7,656) | (782)
Proceeds from other borrowings | 0 | 0 | 251
Principal payments on other borrowings | (36) | (36) | (88)
Net cash provided by (used in) financing activities | 1,701 | (21,143) | 143,680
Foreign currency effect on cash and cash equivalents | 351 | 71 | (207)
Net increase in cash and cash equivalents | 26,854 | 1,747 | 10,326
Cash and cash equivalents at beginning of period | 32,059 | 30,312 | 19,986
Cash and cash equivalents at end of period | 58,913 | 32,059 | 30,312
Supplemental disclosures of cash flow information: |  |  |
Cash paid for interest | 1,413 | 1,164 | 569
Cash paid for income taxes | 3,836 | 750 | 741
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 | 28,516 | 0
Acquisition-related shares issued | 0 | 1,836 | 0
Unrealized holding gain (loss) on available-for-sale investments | $ 889 | $ 283 | $ (165)

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