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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, 2019   255,417,869        
Beginning balance at Dec. 31, 2019 $ 476,425 $ 2,598 $ 2,227,225 $ 12,387 $ 2,825 $ (1,768,610)
Increase (Decrease) in Stockholders' Equity            
Stock options exercised, net (in shares)   1,609,235        
Stock options exercised, net 10,733 $ 16 10,717      
Employee withholding taxes related to restricted stock unit vesting (in shares)   1,196,738        
Employee withholding taxes related to restricted stock unit vesting (8,097)   (8,097)      
Stock-based compensation 21,004   21,004      
Unrealized holding gain on available-for-sale securities 248       248  
Foreign currency translation adjustment 2,080       2,080  
Net loss (141,440)         (141,440)
Ending balance (in shares) at Jun. 30, 2020   258,223,842        
Ending balance at Jun. 30, 2020 360,953 $ 2,614 2,250,849 12,387 5,153 (1,910,050)
Beginning balance (in shares) at Mar. 31, 2020   257,449,955        
Beginning balance at Mar. 31, 2020 402,594 $ 2,607 2,238,346 12,387 6,812 (1,857,558)
Increase (Decrease) in Stockholders' Equity            
Stock options exercised, net (in shares)   650,288        
Stock options exercised, net 4,656 $ 7 4,649      
Employee withholding taxes related to restricted stock unit vesting (in shares)   123,599        
Employee withholding taxes related to restricted stock unit vesting (554)   (554)      
Stock-based compensation 8,408   8,408      
Unrealized holding gain on available-for-sale securities 457       457  
Foreign currency translation adjustment (2,116)       (2,116)  
Net loss (52,492)         (52,492)
Ending balance (in shares) at Jun. 30, 2020   258,223,842        
Ending balance at Jun. 30, 2020 $ 360,953 $ 2,614 2,250,849 12,387 5,153 (1,910,050)
Beginning balance (in shares) at Dec. 31, 2020 262,063,461 262,063,461        
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) 945,000 922,662        
Stock options exercised, net $ 6,661 $ 9 6,652      
Employee withholding taxes related to restricted stock unit vesting (in shares)   987,330        
Employee withholding taxes related to restricted stock unit vesting (14,438)   (14,438)      
Stock-based compensation 32,090   32,090      
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      
Unrealized holding gain on available-for-sale securities 12       12  
Foreign currency translation adjustment 843       843  
Net loss $ (116,889)         (116,889)
Ending balance (in shares) at Jun. 30, 2021 266,532,536 266,532,536        
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      
Employee withholding taxes related to restricted stock unit vesting (in shares)   90,267        
Employee withholding taxes related to restricted stock unit vesting (244)   (244)      
Stock-based compensation 11,736   11,736      
Unrealized holding gain 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 266,532,536 266,532,536        
Ending balance at Jun. 30, 2021 $ 213,910 $ 2,685 $ 2,364,494 $ 0 $ 9,082 $ (2,162,351)