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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018 $ 479,079 $ 14 $ 1,948,300 $ (1,468,863) $ (372)
Issuance of common stock from exercise of stock options and units     6,623    
Issuance of common stock pursuant to employee stock purchase plan     2,199    
Stock-based compensation     40,332    
Net loss (140,245)     (140,245)  
Ending balance at Jun. 30, 2019 388,914 14 1,997,454 (1,609,108) 554
Other comprehensive (loss) income 926        
Beginning balance at Mar. 31, 2019 418,356 14 1,972,302 (1,554,167) 207
Issuance of common stock from exercise of stock options and units     2,447    
Issuance of common stock pursuant to employee stock purchase plan     2,199    
Stock-based compensation     20,506    
Net loss (54,941)     (54,941)  
Ending balance at Jun. 30, 2019 388,914 14 1,997,454 (1,609,108) 554
Other comprehensive (loss) income 347        
Beginning balance at Dec. 31, 2019 699,135 15 2,402,945 (1,704,122) 297
Issuance of common stock from exercise of stock options and units     47,185    
Issuance of common stock pursuant to employee stock purchase plan     3,970    
Stock-based compensation     41,704    
Net loss (130,164)     (130,164)  
Ending balance at Jun. 30, 2020 663,013 15 2,495,804 (1,834,286) 1,480
Other comprehensive (loss) income 1,183        
Beginning balance at Mar. 31, 2020 638,382 15 2,428,987 (1,792,145) 1,525
Issuance of common stock from exercise of stock options and units     43,431    
Issuance of common stock pursuant to employee stock purchase plan     3,970    
Stock-based compensation     19,416    
Net loss (42,141)     (42,141)  
Ending balance at Jun. 30, 2020 663,013 $ 15 $ 2,495,804 $ (1,834,286) $ 1,480
Other comprehensive (loss) income $ (45)