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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