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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)     334,705            
Stock options exercised, net 1,858   $ 3   1,855        
Vesting of restricted stock units, net of taxes (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 gain (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            
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 taxes (in shares)     133,555            
Vesting of restricted stock units, net of taxes (285)       (285)        
Stock-based compensation 12,463       12,463        
Unrealized gain (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            
Ending balance at Jun. 30, 2022 $ 173,425   $ 2,811   2,631,110   83 (17,240) (2,443,339)
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) 655,000   653,217            
Stock options exercised, net $ 4,405   $ 7   4,398        
Vesting of restricted stock units, net of taxes (in shares)     1,768,751            
Vesting of restricted stock units, net of taxes (14,008)       (14,008)        
Stock-based compensation 51,471       51,471        
Warrants exercised (in shares)     1,220,100            
Warrants exercised 12   $ 12   12   (12)    
Issuance of shares in connection with at-the-market offering, net of issuance costs (in shares)       2,242,582          
Issuance of shares in connection with at-the-market offering, net of issuance costs   $ 26,553   $ 22   $ 26,531      
Unrealized gain (loss) on available-for-sale securities (61)             (61)  
Foreign currency translation adjustment 16,326             16,326  
Net loss $ (96,164)               (96,164)
Ending balance (in shares) at Jun. 30, 2023 286,992,923   286,992,923            
Ending balance at Jun. 30, 2023 $ 111,581   $ 2,856   2,733,148   71 4,160 (2,628,654)
Beginning balance (in shares) at Mar. 31, 2023     283,300,585            
Beginning balance at Mar. 31, 2023 102,573   $ 2,820   2,691,836   83 (6,744) (2,585,422)
Increase (Decrease) in Stockholders' Equity                  
Stock options exercised, net (in shares)     269,109            
Stock options exercised, net 1,750   $ 4   1,746        
Vesting of restricted stock units, net of taxes (in shares)     155,776            
Vesting of restricted stock units, net of taxes (1,202)       (1,202)        
Stock-based compensation 16,577       16,577        
Warrants exercised (in shares)     1,220,100            
Warrants exercised 12   $ 12   12   (12)    
Issuance of shares in connection with at-the-market offering, net of issuance costs (in shares)       2,047,353          
Issuance of shares in connection with at-the-market offering, net of issuance costs   $ 24,199   $ 20   $ 24,179      
Unrealized gain (loss) on available-for-sale securities 24             24  
Foreign currency translation adjustment 10,880             10,880  
Net loss $ (43,232)               (43,232)
Ending balance (in shares) at Jun. 30, 2023 286,992,923   286,992,923            
Ending balance at Jun. 30, 2023 $ 111,581   $ 2,856   $ 2,733,148   $ 71 $ 4,160 $ (2,628,654)