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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jan. 31, 2022 | Jan. 31, 2021
Operating activities: |  |
Net income | $ 892 | $ 1,035
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation | 724 | 437
Depreciation and amortization expense | 1,059 | 881
Net gain on disposal of equipment | (4) | 0
Gain on termination of operating lease | 0 | (75)
Operating lease right-of use assets | 535 | 226
Provision for doubtful accounts | 117 | 49
Changes in operating assets and liabilities: |  |
Accounts receivable | (1,693) | (1,401)
Prepaid expenses and other current assets | 397 | (34)
Accounts payable | 1,772 | (1,395)
Accrued liabilities | (205) | (122)
Other current liabilities | 15 | 0
Other non-current liabilities | 50 | 3
Operating lease liabilities | (403) | (106)
Deferred revenue | 2,445 | 801
Net cash provided by operating activities | 5,701 | 299
Investing activities: |  |
Purchase of property and equipment | (1,878) | (2,427)
Refund of security deposit | 0 | 92
Net cash used in investing activities | (1,878) | (2,335)
Financing activities: |  |
Proceeds from exercise of options | 191 | 1,296
Finance lease payments | 0 | (173)
Net cash provided by financing activities | 191 | 1,123
Increase (decrease) in cash | 4,014 | (913)
Cash at beginning of period | 4,687 | 8,342
Cash at end of period | 8,701 | 7,429
Non-cash investing activities: |  |
Right-of-use assets obtained in exchange for operating lease liabilities | 205 | 3,872
Equipment acquired in accounts payable | $ 79 | $ 0

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