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Condensed consolidated balance sheets - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 219,588,000 $ 30,079,000
Short-term investments 0 14,998,000
Accounts receivable 5,006,000 4,988,000
Inventory 14,167,000 8,965,000
Prepaid expenses and other current assets 5,400,000 3,120,000
Total current assets 244,161,000 62,150,000
Property and equipment, net 8,633,000 7,052,000
Other long-term assets 1,348,000 695,000
Restricted cash 284,000 100,000
Total assets 254,426,000 69,997,000
Current liabilities:    
Accounts payable 2,251,000 4,468,000
Accrued expenses and other current liabilities 11,566,000 6,654,000
Deferred revenue 3,903,000 4,423,000
Total current liabilities 17,720,000 15,545,000
Preferred stock warrant liability   4,117,000
Notes payable, net of unamortized discount   24,810,000
Deferred rent, long term 728,000 705,000
Other long-term liabilities 1,233,000  
Total liabilities 19,681,000 45,177,000
Commitments and contingencies (Note 16)
Redeemable convertible preferred stock (Series A1, B1, C1, C2, D1, and D2), $0.01 par value; zero shares and 161,455,689 shares authorized at September 30, 2021 and December 31, 2020, respectively; zero shares and 133,021,640 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively.   151,826,000
Stockholders' equity (deficit):    
Preferred stock, $0.01 par value: 10,000,000 shares and zero shares authorized at September 30, 2021 and December 31, 2020, respectively; zero shares issued and outstanding at September 30, 2021 and December 31, 2020
Additional paid-in capital 534,839,000 114,575,000
Accumulated deficit (300,507,000) (241,588,000)
Accumulated other comprehensive income   1,000
Total stockholders' equity (deficit) 234,745,000 (127,006,000)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) 254,426,000 69,997,000
Common Class A    
Stockholders' equity (deficit):    
Common stock 344,000 $ 6,000
Common Class B    
Stockholders' equity (deficit):    
Common stock $ 69,000