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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
ATM
Common Stock
Common Stock
ATM
Additional Paid-In Capital
Additional Paid-In Capital
ATM
Warrants
Other Comprehensive Gain (Loss)
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2021     278,912,800            
Beginning balance at Dec. 31, 2021 $ 307,369   $ 2,808   $ 2,595,419   $ 83 $ 4,981 $ (2,295,922)
Increase (Decrease) in Stockholders' Equity                  
Stock options exercised, net (in shares)     145,449            
Stock options exercised, net 859   $ 1   858        
Vesting of restricted stock units, net of taxes (in shares)     1,075,607            
Vesting of restricted stock units, net of taxes (8,993)       (8,993)        
Stock-based compensation 30,651       30,651        
Unrealized loss on available-for-sale securities (338)             (338)  
Foreign currency translation adjustment (5,671)             (5,671)  
Net loss (85,260)               (85,260)
Ending balance (in shares) at Mar. 31, 2022     280,133,856            
Ending balance at Mar. 31, 2022 $ 238,617   $ 2,809   2,617,935   83 (1,028) (2,381,182)
Beginning balance (in shares) at Dec. 31, 2022 281,108,273   281,108,273            
Beginning balance at Dec. 31, 2022 $ 123,047   $ 2,815   2,664,744   83 (12,105) (2,532,490)
Increase (Decrease) in Stockholders' Equity                  
Stock options exercised, net (in shares) 384,000   384,108            
Stock options exercised, net $ 2,655   $ 3   2,652        
Vesting of restricted stock units, net of taxes (in shares)     1,612,975            
Vesting of restricted stock units, net of taxes (12,806)       (12,806)        
Stock-based compensation 34,894       34,894        
Issuance of shares in connection with at-the-market offering, net of issuance costs (in shares)       195,229          
Issuance of shares in connection with at-the-market offering, net of issuance costs   $ 2,354   $ 2   $ 2,352      
Unrealized loss on available-for-sale securities (85)             (85)  
Foreign currency translation adjustment 5,446             5,446  
Net loss $ (52,932)               (52,932)
Ending balance (in shares) at Mar. 31, 2023 283,300,585   283,300,585            
Ending balance at Mar. 31, 2023 $ 102,573   $ 2,820   $ 2,691,836   $ 83 $ (6,744) $ (2,585,422)