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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 $ (58,919) $ (25,739)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,079 1,190
Stock-based compensation expense 1,165 361
Change in fair value of preferred stock warrant liability 19,643 (549)
Provision recorded for inventory 44  
Noncash interest expense 390 1,378
Gain on disposal of property and equipment (18)  
Accretion on investments (4) (11)
Loss on extinguishment of debt 3,100 2,910
Changes in operating assets and liabilities    
Accounts receivable (18) (2,036)
Inventory (5,247) (2,531)
Prepaid expenses and other current assets (2,552) (579)
Other long-term assets (653) (591)
Accounts payable (2,216) (1,613)
Accrued expenses and other current liabilities 2,646 618
Deferred revenue (520) 1,295
Deferred rent, long term 22 72
Other long-term liabilities (19)  
Net cash used in operating activities (42,077) (25,825)
Cash flows from investing activities:    
Purchases of property and equipment (1,251) (566)
Proceeds from sale of property and equipment 20  
Purchases of investments   (24,980)
Maturity of investments 15,000  
Net cash provided by (used in) investing activities 13,769 (25,546)
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 79,743 49,935
Proceeds from issuance of common stock upon option exercise 294 5
Proceeds from issuance of restricted stock award 523  
Proceeds from initial public offering of Class A common stock, net of issuance costs 165,453  
Proceeds from exercise of common stock warrants 13  
Proceeds from issuance of convertible notes, net of issuance costs   9,500
Proceeds from issuance of notes payable, net of issuance costs   25,000
Payments of debt issuance costs   (857)
Repayment of term loans (26,159) (18,000)
Payment of debt extinguishment fees (1,866) (1,398)
Net cash provided by financing activities 218,001 64,185
Net increase in cash, cash equivalents and restricted cash 189,693 12,814
Cash, cash equivalents and restricted cash at beginning of period 30,179 12,611
Cash, cash equivalents and restricted cash at end of period 219,872 25,425
Supplemental disclosure of cash flow information    
Cash paid for interest 1,891 979
Supplemental disclosure of non-cash investing activities    
Establishment of property and equipment retirement cost asset 188  
Purchases of property and equipment in accounts payable 857 14
Supplemental disclosure of non-cash financing activities    
Conversion of convertible notes to Series C1 preferred stock   9,523
Issuance of preferred stock warrants in connection with redeemable convertible preferred stock   652
Initial fair value of derivative liability   2,375
Assets acquired under capital lease 372  
Offering costs included in accounts payable and accrued expenses 1,408  
Conversion of preferred stock to common stock 235,766  
Conversion of preferred stock warrants to common stock warrants 23,760  
Accretion of redeemable convertible preferred stock to redemption value 1,761 2,882
Cumulative redeemable convertible preferred stock dividends $ 2,747 $ 2,987