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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 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)     506,823            
Stock options exercised, net 3,191   $ 5   3,186        
Vesting of restricted stock units, net of taxes (in shares)     1,467,513            
Vesting of restricted stock units, net of taxes (11,119)       (11,119)        
Stock-based compensation 57,886       57,886        
Unrealized (loss) gain on available-for-sale securities (84)             (84)  
Foreign currency translation adjustment (43,975)             (43,975)  
Net loss (180,703)               (180,703)
Ending balance (in shares) at Sep. 30, 2022     280,887,136            
Ending balance at Sep. 30, 2022 132,565   $ 2,813   2,645,372   83 (39,078) (2,476,625)
Beginning balance (in shares) at Jun. 30, 2022     280,456,667            
Beginning balance at Jun. 30, 2022 173,425   $ 2,811   2,631,110   83 (17,240) (2,443,339)
Increase (Decrease) in Stockholders' Equity                  
Stock options exercised, net (in shares)     172,118            
Stock options exercised, net 1,333   $ 2   1,331        
Vesting of restricted stock units, net of taxes (in shares)     258,351            
Vesting of restricted stock units, net of taxes (1,841)       (1,841)        
Stock-based compensation 14,772       14,772        
Unrealized (loss) gain on available-for-sale securities 283             283  
Foreign currency translation adjustment (22,121)             (22,121)  
Net loss (33,286)               (33,286)
Ending balance (in shares) at Sep. 30, 2022     280,887,136            
Ending balance at Sep. 30, 2022 $ 132,565   $ 2,813   2,645,372   83 (39,078) (2,476,625)
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) 1,032,000   1,025,684            
Stock options exercised, net $ 7,847   $ 11   7,836        
Vesting of restricted stock units, net of taxes (in shares)     2,068,048            
Vesting of restricted stock units, net of taxes (16,355)       (16,355)        
Stock-based compensation 67,982       67,982        
Issuance of shares in connection with at-the-market offering, net of issuance costs (in shares)       5,244,936          
Issuance of shares in connection with at-the-market offering, net of issuance costs   $ 63,108   $ 52   $ 63,056      
Warrants exercised (in shares)     1,220,100            
Warrants exercised 12   $ 12   12   (12)    
Unrealized (loss) gain on available-for-sale securities (79)             (79)  
Foreign currency translation adjustment 5,416             5,416  
Net loss $ (117,741)               (117,741)
Ending balance (in shares) at Sep. 30, 2023 290,667,041   290,667,041            
Ending balance at Sep. 30, 2023 $ 133,237   $ 2,890   2,787,275   71 (6,768) (2,650,231)
Beginning balance (in shares) at Jun. 30, 2023     286,992,923            
Beginning balance at Jun. 30, 2023 111,581   $ 2,856   2,733,148   71 4,160 (2,628,654)
Increase (Decrease) in Stockholders' Equity                  
Stock options exercised, net (in shares)     372,467            
Stock options exercised, net 3,442   $ 4   3,438        
Vesting of restricted stock units, net of taxes (in shares)     299,297            
Vesting of restricted stock units, net of taxes (2,347)       (2,347)        
Stock-based compensation 16,511       16,511        
Issuance of shares in connection with at-the-market offering, net of issuance costs (in shares)       3,002,354          
Issuance of shares in connection with at-the-market offering, net of issuance costs   $ 36,555   $ 30   $ 36,525      
Unrealized (loss) gain on available-for-sale securities (18)             (18)  
Foreign currency translation adjustment (10,910)             (10,910)  
Net loss $ (21,577)               (21,577)
Ending balance (in shares) at Sep. 30, 2023 290,667,041   290,667,041            
Ending balance at Sep. 30, 2023 $ 133,237   $ 2,890   $ 2,787,275   $ 71 $ (6,768) $ (2,650,231)