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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Cash flows from operating activities: |  |
Net loss | $ (6,754,000) | $ (4,157,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 776,000 | 277,000
Stock-based compensation | 1,171,000 | 1,177,000
Change in fair value of warrant liability |  | 39,000
Amortization of debt discount |  | 348,134
Accrued interest expense |  | 165,000
Amortization of lease right-of-use assets | 121,000 | 60,000
Change in operating lease liabilities | (107,000) | (58,000)
Other | 152,000 | 9,000
Changes in assets and liabilities: |  |
Accounts receivable | 331,000 | 688,000
Inventories | (698,000) | 155,000
Tax credits and receivables | (17,000) | (246,000)
Prepaid expenses and other assets | (175,000) | 121,000
Accounts payable | 4,000 | 133,000
Deferred revenue and other liabilities | (544,000) | 37,000
Net cash used in operating activities | (5,740,000) | (1,252,000)
Cash flows from investing activities: |  |
Purchases of property and equipment | (76,000) | (9,000)
Purchases of intangible assets | (20,000) |
Proceeds from maturities of marketable securities | 4,240,000 |
Purchases of marketable securities and investments | (497,000) |
Net cash provided by (used in) investing activities | 3,647,000 | (9,000)
Cash flows from financing activities: |  |
Taxes paid to net share settle equity awards | (9,000) |
Net proceeds from loan facility |  | 552,000
Net cash provided by (used in) financing activities | (9,000) | 552,000
Net decrease in cash and cash equivalents | (2,102,000) | (709,000)
Cash and cash equivalents at beginning of period | 5,893,000 | 1,711,000
Cash and cash equivalents at end of period | 3,791,000 | $ 1,002,000
Supplemental disclosure: |  |
Recognition of right-of-use asset and lease liability | 274,000 |
Unrealized loss on securities | $ 37,000 |

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