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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
Balance (in shares) at Dec. 31, 2019   255,417,869        
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 issued from exercise of stock options, net (in shares)   958,947        
Stock issued from exercise of stock options, net 6,077 $ 9 6,068      
Restricted stock tax vesting (in shares)   1,073,139        
Restricted stock tax vesting (7,543)   (7,543)      
Stock-based compensation 12,596   12,596      
Unrealized holding loss on available-for-sale securities (209)       (209)  
Foreign currency translation adjustment 4,196       4,196  
Net loss (88,948)         (88,948)
Balance (in shares) at Mar. 31, 2020   257,449,955        
Balance at Mar. 31, 2020 $ 402,594 $ 2,607 2,238,346 12,387 6,812 (1,857,558)
Balance (in shares) at Dec. 31, 2020 262,063,461 262,063,461        
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 issued from exercise of stock options, net (in shares)   488,111        
Stock issued from exercise of stock options, net 4,161 $ 4 4,157      
Restricted stock tax vesting (in shares)   897,063        
Restricted stock tax vesting (14,194)   (14,194)      
Stock-based compensation 20,354   20,354      
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 $ 0 21      
Unrealized holding loss on available-for-sale securities 0          
Foreign currency translation adjustment 608       608  
Net loss $ (65,664)         (65,664)
Balance (in shares) at Mar. 31, 2021 266,007,718 266,007,718        
Balance at Mar. 31, 2021 $ 250,896 $ 2,680 $ 2,350,507 $ 0 $ 8,835 $ (2,111,126)