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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (32,508) $ (10,707)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,159 95
Depreciation of property and equipment 112 52
Amortization of deferred financing costs and loan discount 206 217
Changes in fair value of convertible preferred stock warrants 13,294 (387)
Changes in operating assets and liabilities:    
Accounts receivable (2,140) 138
Inventory (97) (1,243)
Prepaid expenses and other current assets (2,359) (241)
Accounts payable 58 228
Accrued expenses 1,558 (164)
Net cash used in operating activities (20,717) (12,012)
Cash flows from investing activities:    
Purchase of property and equipment (645) (210)
Net cash used in investing activities (645) (210)
Cash flows from financing activities:    
Proceeds from the exercise of common stock options 10 0
Proceeds from issuance of Series G Preferred Stock, net of fees 0 49,783
Payments related to reverse stock split (1) 0
Proceeds from the issuance of common stock, net of offering costs 133,161 0
Net cash provided by financing activities 133,170 49,783
Effect of currency exchange on cash and cash equivalents (7) (7)
Net change in cash and cash equivalents 111,801 37,554
Cash and cash equivalents at beginning of year 59,112 25,741
Cash and cash equivalents at end of period 170,913 63,295
Supplemental Information:    
Cash paid for interest 1,522 1,528
Cash paid for income taxes $ 1 $ 10