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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Warrants
Other Comprehensive Gain (Loss)
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020   262,063,461        
Beginning balance at Dec. 31, 2020 $ 286,380 $ 2,650 $ 2,308,578 $ 12,387 $ 8,227 $ (2,045,462)
Increase (Decrease) in Stockholders' Equity            
Stock options exercised, net (in shares)   922,662        
Stock options exercised, net 6,661 $ 9 6,652      
Vesting of restricted stock units, net of tax (in shares)   987,330        
Vesting of restricted stock units, net of taxes (14,438)   (14,438)      
Stock-based compensation 32,090   32,090      
Unrealized holding loss on available-for-sale securities 12       12  
Foreign currency translation adjustment 843       843  
Net loss (116,889)         (116,889)
Warrants exercised (in shares)   2,554,999        
Warrants exercised 19,230 $ 26 31,591 (12,387)    
Equity component of the convertible notes (in shares)   4,084        
Equity component of the convertible notes 21   21      
Ending balance (in shares) at Jun. 30, 2021   266,532,536        
Ending balance at Jun. 30, 2021 213,910 $ 2,685 2,364,494 0 9,082 (2,162,351)
Beginning balance (in shares) at Mar. 31, 2021   266,007,718        
Beginning balance at Mar. 31, 2021 250,896 $ 2,680 2,350,507   8,835 (2,111,126)
Increase (Decrease) in Stockholders' Equity            
Stock options exercised, net (in shares)   434,551        
Stock options exercised, net 2,500 $ 5 2,495      
Vesting of restricted stock units, net of tax (in shares)   90,267        
Vesting of restricted stock units, net of taxes (244)   (244)      
Stock-based compensation 11,736   11,736      
Unrealized holding loss on available-for-sale securities 12       12  
Foreign currency translation adjustment 235       235  
Net loss (51,225)         (51,225)
Ending balance (in shares) at Jun. 30, 2021   266,532,536        
Ending balance at Jun. 30, 2021 $ 213,910 $ 2,685 2,364,494 0 9,082 (2,162,351)
Beginning balance (in shares) at Dec. 31, 2021 278,912,800 278,912,800        
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) 339,000 334,705        
Stock options exercised, net $ 1,858 $ 3 1,855      
Vesting of restricted stock units, net of tax (in shares)   1,209,162        
Vesting of restricted stock units, net of taxes (9,278)   (9,278)      
Stock-based compensation 43,114   43,114      
Unrealized holding loss on available-for-sale securities (367)       (367)  
Foreign currency translation adjustment (21,854)       (21,854)  
Net loss $ (147,417)         (147,417)
Ending balance (in shares) at Jun. 30, 2022 280,456,667 280,456,667        
Ending balance at Jun. 30, 2022 $ 173,425 $ 2,811 2,631,110 83 (17,240) (2,443,339)
Beginning balance (in shares) at Mar. 31, 2022   280,133,856        
Beginning balance at Mar. 31, 2022 238,617 $ 2,809 2,617,935 83 (1,028) (2,381,182)
Increase (Decrease) in Stockholders' Equity            
Stock options exercised, net (in shares)   189,256        
Stock options exercised, net 999 $ 2 997      
Vesting of restricted stock units, net of tax (in shares)   133,555        
Vesting of restricted stock units, net of taxes (285)   (285)      
Stock-based compensation 12,463   12,463      
Unrealized holding loss on available-for-sale securities (29)       (29)  
Foreign currency translation adjustment (16,183)       (16,183)  
Net loss $ (62,157)         (62,157)
Ending balance (in shares) at Jun. 30, 2022 280,456,667 280,456,667        
Ending balance at Jun. 30, 2022 $ 173,425 $ 2,811 $ 2,631,110 $ 83 $ (17,240) $ (2,443,339)