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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)   488,111        
Stock options exercised, net 4,161 $ 4 4,157      
Vesting of restricted stock units, net of tax (in shares)   897,063        
Vesting of restricted stock units, net of taxes (14,194)   (14,194)      
Stock-based compensation 20,354   20,354      
Unrealized holding loss on available-for-sale securities 0          
Foreign currency translation adjustment 608       608  
Net loss (65,664)         (65,664)
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 Mar. 31, 2021   266,007,718        
Ending balance at Mar. 31, 2021 $ 250,896 $ 2,680 2,350,507 0 8,835 (2,111,126)
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) 149,000 145,449        
Stock options exercised, net $ 859 $ 1 858      
Vesting of restricted stock units, net of tax (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 holding 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 280,133,856 280,133,856        
Ending balance at Mar. 31, 2022 $ 238,617 $ 2,809 $ 2,617,935 $ 83 $ (1,028) $ (2,381,182)