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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Cash flows from operating activities: |  |
Net loss | $ (7,212) | $ (9,280)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 190 | 554
Stock-based compensation | 283 | 296
Amortization of lease liability and lease interest expense | (199) |
Loss on disposal of asset |  | 18
Deferred income taxes |  | (3)
Bad debt repayment | 2 |
Changes in operating assets and liabilities: |  |
Accounts receivable | 378 | (1,229)
Non-trade receivable | (1,730) |
Inventory | 324 | 779
Prepaid expenses and other current assets | 2,295 | 1,496
Other assets | 592 | (278)
Accounts payable | 3,966 | 2,338
Accrued expenses | 369 | (2,896)
Warranty liability | (54) |
Deferred revenue | 161 | (5)
Income tax payable | 26 | 13
Net cash used in operating activities: | (609) | (8,197)
Cash flows from investing activities: |  |
Purchase of property and equipment | (3) |
Net cash used in investing activities | (3) |
Cash flows from financing activities: |  |
Repayment of current portion of long-term debt | 36 | 37
Proceeds from issuance of common stock, net of costs | 45 |
Proceeds from exercise of stock options |  | 5
Net cash provided by (used in) financing activities | 9 | (32)
Net increase (decrease) in cash and cash equivalents | (603) | (8,229)
Cash and cash equivalents at beginning of period | 11,233 | 22,141
Cash and cash equivalents at end of period | 10,630 | 13,912
Supplemental disclosure of cash flow information: |  |
Cash paid for interest | 39 | $ 37
Cash paid for income taxes | 1 |
Non-cash financing activities: |  |
Shares issued under bonus plans | $ 253 |

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