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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Convertible preferred stock
Convertible preferred stock
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated and other comprehensive loss
Total
Balances, Beginning at Dec. 31, 2020 $ 329,983          
Balances, Beginning (in shares) at Dec. 31, 2020 223,541,754          
Increase (Decrease) in Temporary Equity [Roll Forward]            
Conversion of Series G preferred stock $ (329,983)          
Conversion of Series G preferred stock (in shares) (223,541,754)          
Balances, Beginning at Dec. 31, 2020   $ 4 $ 58,624 $ (351,676) $ (190) $ (293,238)
Balances, Beginning (in shares) at Dec. 31, 2020   360,412        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options     23     $ 23
Exercise of stock options (in shares)   59,341       59,341
Employee stock compensation     1,912     $ 1,912
Issuance of common stock, net of offering costs   $ 81 133,080     133,161
Issuance of common stock, net of offering costs (in shares)   8,050,000        
Reverse stock split     (1)     (1)
Conversion of Series G preferred stock   $ 119 347,069     347,188
Conversion of Series G preferred stock (in shares)   11,929,584        
Net loss       (43,078)   (43,078)
Cumulative translation adjustment         (8) (8)
Balances, Ending at Dec. 31, 2021   $ 204 540,707 (394,754) (198) 145,959
Balances, Ending (in shares) at Dec. 31, 2021   20,399,337        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options   $ 2 182     $ 184
Exercise of stock options (in shares)   150,509       150,509
Proceeds from Employee Stock Purchase Plan   $ 1 586     $ 587
Proceeds from Employee Stock Purchase Plan (shares)   113,890        
Employee stock compensation     3,887     3,887
Net loss       (41,428)   (41,428)
Cumulative translation adjustment         (9) (9)
Balances, Ending at Dec. 31, 2022   $ 207 $ 545,362 $ (436,182) $ (207) $ 109,180
Balances, Ending (in shares) at Dec. 31, 2022   20,663,736