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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Operating activities |  |
Net income | $ 10,145 | $ 7,114
Depreciation and amortization | 8,115 | 7,003
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred financing costs charged to interest expense | 792 | 721
Stock based compensation expense | 1,660 | 910
Deferred taxes, net | 1,213 | 2,308
Gain from lease modification | 0 | (121)
Changes in operating assets and liabilities |  |
Accounts receivable | (906) | (5,408)
Other current assets | (766) | (1,592)
Accrued payroll | (1,486) | 489
Deferred revenue | 22,273 | 0
Accounts payable, accrued expenses, and other current liabilities | 4,139 | 7,188
Other long-term assets and liabilities | 486 | 839
Net cash provided by operating activities | 45,665 | 19,451
Investing activities |  |
Business acquisition, net of cash acquired | 59 | (32,678)
Purchase of equipment and improvements | (103) | (152)
Net cash used in investing activities | (44) | (32,830)
Financing activities |  |
Proceeds from debt obligations | 0 | 33,000
Repayment of debt obligations | (23,250) | (19,000)
Repurchase of common stock | 0 | (211)
Payment of deferred financing costs | (43) | (898)
Proceeds from stock option exercise | 366 | 55
Net cash (used in)/provided by financing activities | (22,927) | 12,946
Net change in cash and cash equivalents | 22,694 | (433)
Cash and cash equivalents at beginning of year | 1,357 | 1,790
Cash and cash equivalents at end of year | 24,051 | 1,357
Supplemental disclosures of cash flow information |  |
Cash paid during the year for interest | 2,941 | 2,806
Cash paid during the year for income taxes | 936 | 917
Supplemental disclosures of non-cash activity |  |
Non-cash cancellation of common stock | $ 68 | $ 211

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