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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (65,011) $ (26,551)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,014 922
Noncash common stock purchase agreement costs 1,583 0
Inventory write-downs 1,203 72
Change in fair value of embedded derivative liability and warrant liabilities (223) (1,410)
Noncash gain on PPP loan forgiveness (2,297) 0
Stock-based compensation 10,018 1,952
Amortization of debt issuance costs 725 97
Amortization of debt discount 752 830
Amortization of premiums on marketable securities, net of change in accrued interest 310 0
Other 287 68
Changes in operating assets and liabilities:    
Accounts receivable, net (4,066) (13)
Inventories, net (2,633) (309)
Prepaid and other current assets (3,655) 3,811
Other noncurrent assets (1,483) (193)
Accounts payable 557 484
Accrued expenses and other current liabilities 5,496 1,377
Deferred rent (538) (496)
Contract liabilities 2,258 (290)
Net cash used in operating activities (55,703) (19,689)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (1,021) (4,036)
Purchase of available-for-sale debt securities (150,525) 0
Net cash used in investing activities (151,546) (4,036)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the exercise of stock options 150 663
Proceeds from Business Combination and PIPE financing 256,811 0
Transaction costs related to Business Combination and PIPE financing (52,372) 0
Proceeds from the issuance of convertible notes 8,045 29,990
Proceeds from bank loans 10,000 2,270
Principal payments on bank loans (13,333) (667)
Payments of debt issuance costs (717) (238)
Repurchase of stock options (1,500) 0
Net cash provided by financing activities 207,084 32,018
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (165) 8,293
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period 16,498 8,205
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Ending 16,333 16,498
SUPPLEMENTAL CASH FLOW INFORMATION:    
Cash paid for interest 358 197
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:    
Purchases of property and equipment included in accounts payable and accrued liabilities 270 13
Conversion of Series A and Series B preferred stock into Class A common stock 62,639 0
Conversion of convertible notes and accrued interest into Class A common stock 39,095 0
Assumption of the private placement warrant liability in connection with Business Combination 268 0
Transaction costs paid in 2020, previously recorded to other non-current assets and reclassified to additional paid-in capital in 2021 289 0
Taxes related to net share settlement of equity awards included in accrued liabilities $ 835 $ 0