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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Oct. 31, 2021 | Oct. 31, 2020
Operating activities: |  |
Net income | $ 105 | $ 76
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Stock-based compensation | 414 | 205
Depreciation and amortization expense | 663 | 584
Net gain on disposal of equipment | (4) | 0
Gain on termination of operating lease | 0 | (75)
Operating lease right-of use assets | 519 | 79
Provision for doubtful accounts | 117 | 49
Changes in operating assets and liabilities: |  |
Accounts receivable | (1,321) | (1,237)
Prepaid expenses and other current assets | 226 | (92)
Accounts payable | 1,506 | 568
Accrued liabilities | (320) | (507)
Other current liabilities | 15 | 0
Other non-current liabilities | 54 | 3
Operating lease liabilities | (406) | 138
Deferred revenue | (124) | 373
Net cash provided by operating activities | 1,444 | 164
Investing activities: |  |
Purchase of property and equipment | (1,473) | (1,224)
Refund of security deposit | 0 | 92
Net cash used in investing activities | (1,473) | (1,132)
Financing activities: |  |
Proceeds from exercise of options | 123 | 1,294
Finance lease payments | 0 | (115)
Net cash provided by financing activities | 123 | 1,179
Increase in cash | 94 | 211
Cash at beginning of period | 4,687 | 8,342
Cash at end of period | 4,781 | 8,553
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
Unpaid portion of property and equipment purchase | $ 0 | $ 240

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