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Unaudited Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Revision of Prior Period Accounting Standards Update Adjustment [Member]
Common Stock
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Accumulated Deficit [Member]
Revision of Prior Period Accounting Standards Update Adjustment [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2018 $ (268,761) $ (3,093) $ 9 $ 963,458 $ (3,554) $ (1,228,674) $ (3,093)  
Beginning Balance, Shares at Dec. 31, 2018     87,560,694          
Net loss (123,653)         (123,653)    
Currency translation adjustments, net of tax 674       674      
Stock-based compensation expense 12,711     12,711        
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares     359,005          
Tax withholding related to vesting of restricted stock units (834)     (834)        
Issuance of common stock in connection with employee stock purchase plan 922     922        
Issuance of common stock in connection with employee stock purchase plan, Shares     238,127          
Repurchase of 2020 Convertible Notes (795)     (795)        
Ending Balance at Sep. 30, 2019 (382,829)   $ 9 975,462 (2,880) (1,355,420)    
Ending Balance, Shares at Sep. 30, 2019     88,157,826          
Beginning Balance at Jun. 30, 2019 (363,607)   $ 9 971,130 (2,217) (1,332,529)    
Beginning Balance, Shares at Jun. 30, 2019     88,062,965          
Net loss (22,891)         (22,891)    
Currency translation adjustments, net of tax (663)       (663)      
Stock-based compensation expense 4,066     4,066        
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares     13,892          
Tax withholding related to vesting of restricted stock units (27)     (27)        
Issuance of common stock in connection with employee stock purchase plan 293     293        
Issuance of common stock in connection with employee stock purchase plan, Shares     80,969          
Ending Balance at Sep. 30, 2019 (382,829)   $ 9 975,462 (2,880) (1,355,420)    
Ending Balance, Shares at Sep. 30, 2019     88,157,826          
Beginning Balance at Dec. 31, 2019 (398,890) $ (3,665) $ 9 979,499 (2,256) (1,376,142) $ (3,665)  
Beginning Balance, Shares at Dec. 31, 2019     88,240,877          
Net loss (250,881)         (250,881)    
Currency translation adjustments, net of tax (2,067)       (2,067)      
Stock-based compensation expense 9,736     9,736        
Issuance of common stock upon exercise of stock options $ 102     102        
Issuance of common stock upon exercise of stock options, shares 38,383   38,383          
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares     1,708,337          
Tax withholding related to vesting of restricted stock units $ (2,273)     (2,273)        
Issuance of common stock in connection with employee stock purchase plan 744   $ 1 743        
Issuance of common stock in connection with employee stock purchase plan, Shares     327,085          
Settlement of prepaid forward shares [value]     $ (1) 98,858       $ (98,857)
Settlement of prepaid forward shares [shares]     (5,077,400)         5,077,400
Ending Balance at Sep. 30, 2020 (647,194)   $ 9 1,086,665 (4,323) (1,630,688)   $ (98,857)
Ending Balance, Shares at Sep. 30, 2020     85,237,282         5,077,400
Beginning Balance at Jun. 30, 2020 (569,017)   $ 8 1,085,254 (4,858) (1,550,564)   $ (98,857)
Beginning Balance, Shares at Jun. 30, 2020     84,032,343         5,077,400
Net loss (80,124)         (80,124)    
Currency translation adjustments, net of tax 535       535      
Stock-based compensation expense 2,577     2,577        
Issuance of common stock upon exercise of stock options 102     102        
Issuance of common stock upon exercise of stock options, shares     38,383          
Issuance of common stock upon vesting of restricted stock units and restricted stock awards, Shares     1,066,909          
Tax withholding related to vesting of restricted stock units (1,464)     (1,464)        
Issuance of common stock in connection with employee stock purchase plan 197   $ 1 196        
Issuance of common stock in connection with employee stock purchase plan, Shares     99,647          
Ending Balance at Sep. 30, 2020 $ (647,194)   $ 9 $ 1,086,665 $ (4,323) $ (1,630,688)   $ (98,857)
Ending Balance, Shares at Sep. 30, 2020     85,237,282         5,077,400