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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Retained Earnings (Deficit)
Retained Earnings (Deficit)
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2017     223,289,000          
Beginning balance at Dec. 31, 2017 $ 1,115,901 $ 670 $ 2,814 $ 1,050,873 $ 106,923 $ 670 $ (30,972) $ (13,737)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (90,733)       (90,733)      
Foreign currency translation adjustments (1,452)           (1,452)  
Unrealized gain (loss) on marketable securities/Reclassification of marketable securities 86           86  
Equity-based compensation expense 10,621     10,621        
Common shares issued upon vesting of share-based awards (in shares)     1,018,000          
Common shares issued upon vesting of share-based awards 0   $ 12 (12)        
Common shares issued for employee stock purchase plan (“ESPP”) (in shares)     233,000          
Common shares issued for employee stock purchase plan (“ESPP”) 1,315   $ 3 1,312        
Treasury shares withheld (in shares)     (250,000)          
Treasury shares withheld (1,636)             (1,636)
Ending balance (in shares) at Dec. 31, 2018     224,290,000          
Ending balance at Dec. 31, 2018 $ 1,034,772 (700) $ 2,829 1,062,794 16,860 (700) (32,338) (15,373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member              
Net loss $ (235,329)       (235,329)      
Foreign currency translation adjustments 404           404  
Unrealized gain (loss) on marketable securities/Reclassification of marketable securities 0       (1,636)   1,636  
Equity-based compensation expense 11,280     11,280        
Common shares issued upon vesting of share-based awards (in shares)     1,134,000          
Common shares issued upon vesting of share-based awards $ 0   $ 13 (13)        
Common shares issued for employee stock purchase plan (“ESPP”) (in shares) 389,284   389,000          
Common shares issued for employee stock purchase plan (“ESPP”) $ 1,752   $ 4 1,748        
Treasury shares withheld (in shares)     (302,000)          
Treasury shares withheld (1,885)             (1,885)
Ending balance (in shares) at Dec. 31, 2019     225,511,000          
Ending balance at Dec. 31, 2019 810,294 $ (321) $ 2,846 1,075,809 (220,805) $ (321) (30,298) (17,258)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (156,220)       (156,220)      
Foreign currency translation adjustments (1,668)           (1,668)  
Equity-based compensation expense 11,010     11,010        
Common shares issued upon vesting of share-based awards (in shares)     1,464,000          
Common shares issued upon vesting of share-based awards $ 0   $ 16 (16)        
Common shares issued for employee stock purchase plan (“ESPP”) (in shares) 340,950   341,000          
Common shares issued for employee stock purchase plan (“ESPP”) $ 934   $ 4 930        
Treasury shares withheld (in shares)     (421,000)          
Treasury shares withheld (1,282)             (1,282)
Share repurchase program (in shares)     (570,000)          
Share repurchase program (1,498)             (1,498)
Ending balance (in shares) at Dec. 31, 2020     226,325,000          
Ending balance at Dec. 31, 2020 $ 661,249   $ 2,866 $ 1,087,733 $ (377,346)   $ (31,966) $ (20,038)