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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Operating activities |  |
Net income | $ 7,804 | $ 1,814
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 1,985 | 2,062
Amortization of deferred financing costs charged to interest expense | 151 | 210
Stock-based compensation expense | 500 | 458
Deferred taxes, net | 0 | 626
Changes in operating assets and liabilities |  |
Accounts receivable | (13,396) | (12,344)
Other current assets | (632) | 284
Accrued payroll | 1,851 | (538)
Deferred revenue | (12,125) | 0
Accounts payable, accrued expenses, and other current liabilities | (2,335) | (1,185)
Other long-term assets and liabilities | 42 | 95
Net cash used in operating activities | (16,155) | (8,518)
Investing activities |  |
Purchase of equipment and improvements | 0 | (53)
Net cash used in investing activities | 0 | (53)
Financing activities |  |
Proceeds from debt obligations | 6,000 | 9,150
Repayment of debt obligations | (9,875) | (1,750)
Payment of deferred financing costs | 0 | (41)
Proceeds from issuance of common stock upon exercise of options and warrants | 200 | 225
Net cash provided by (used in) financing activities | (3,675) | 7,584
Net change in cash and cash equivalents | (19,830) | (987)
Cash and cash equivalents at beginning of period | 24,051 | 1,357
Cash and cash equivalents at end of period | 4,221 | 370
Supplemental disclosure of cash flow information |  |
Cash paid during the period for interest | $ 513 | $ 852

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