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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
Operating activities: |  |
Net income (loss) | $ (172) | $ 75
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Stock-based compensation | 280 | 120
Depreciation and amortization expense | 317 | 277
Net gain on disposal of equipment | (4) | 0
Gain on termination of operating lease | 0 | (75)
Operating lease right-of use assets | 245 | (67)
Provision for (reversal of) doubtful accounts | 78 | (6)
Changes in operating assets and liabilities: |  |
Accounts receivable | (825) | (263)
Prepaid expenses and other current assets | 93 | 25
Other long term assets | (70) | 0
Accounts payable | 1,372 | (465)
Accrued liabilities | (250) | (348)
Other current liabilities | 15 | 0
Other non-current liabilities | 62 | 1
Operating lease liabilities | (150) | 157
Deferred revenue | (775) | (146)
Net cash provided by (used in) operating activities | 216 | (715)
Investing activities: |  |
Purchase of property and equipment | (907) | (718)
Refund of security deposit | 0 | 92
Net cash used in investing activities | (907) | (626)
Financing activities: |  |
Proceeds from exercise of options | 2 | 0
Finance lease payments | 0 | (58)
Net cash provided by (used in) financing activities | 2 | (58)
Decrease in cash | (689) | (1,399)
Cash at beginning of period | 4,687 | 8,342
Cash at end of period | 3,998 | 6,943
Non-cash investing activities: |  |
Right-of-use assets obtained in exchange for operating lease liabilities | 0 | 3,872
Equipment acquired in accounts payable | $ 79 | $ 0

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