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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2018     224,290          
Balance at beginning of period 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                
Net loss (28,287)       (28,287)      
Foreign currency translation adjustments 250           250  
Equity-based compensation expense 2,574     2,574        
Common shares issued upon vesting of share-based awards (in shares)     720          
Common shares issued upon vesting of share-based awards 0   $ 8 (8)        
Common shares issued for employee stock purchase plan (in shares)     154          
Common shares issued for employee stock purchase plan 692   $ 2 690        
Treasury shares withheld (in shares)     (220)          
Treasury shares withheld (1,452)             (1,452)
Balance at end of period (in shares) at Mar. 31, 2019     224,944          
Balance at end of period at Mar. 31, 2019 1,007,849   $ 2,839 1,066,050 (12,127)   (32,088) (16,825)
Balance at beginning of period (in shares) at Dec. 31, 2018     224,290          
Balance at beginning of period 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                
Net loss (67,236)              
Foreign currency translation adjustments 1,079              
Balance at end of period (in shares) at Sep. 30, 2019     225,503          
Balance at end of period at Sep. 30, 2019 976,034   $ 2,846 1,072,768 (52,712)   (29,623) (17,245)
Balance at beginning of period (in shares) at Mar. 31, 2019     224,944          
Balance at beginning of period at Mar. 31, 2019 1,007,849   $ 2,839 1,066,050 (12,127)   (32,088) (16,825)
Increase (Decrease) in Stockholders' Equity                
Net loss (15,160)       (15,160)      
Foreign currency translation adjustments 458           458  
Reclassification of marketable securities 0       (1,636)   1,636  
Equity-based compensation expense 3,017     3,017        
Common shares issued upon vesting of share-based awards (in shares)     186          
Common shares issued upon vesting of share-based awards 0   $ 2 (2)        
Treasury shares withheld (in shares)     (15)          
Treasury shares withheld (88)             (88)
Balance at end of period (in shares) at Jun. 30, 2019     225,115          
Balance at end of period at Jun. 30, 2019 996,076   $ 2,841 1,069,065 (28,923)   (29,994) (16,913)
Increase (Decrease) in Stockholders' Equity                
Net loss (23,789)       (23,789)      
Foreign currency translation adjustments 371           371  
Equity-based compensation expense 2,647     2,647        
Common shares issued upon vesting of share-based awards (in shares)     217          
Common shares issued upon vesting of share-based awards 0   $ 2 (2)        
Common shares issued for employee stock purchase plan (in shares)     236          
Common shares issued for employee stock purchase plan 1,061   $ 3 1,058        
Treasury shares withheld (in shares)     (65)          
Treasury shares withheld (332)             (332)
Balance at end of period (in shares) at Sep. 30, 2019     225,503          
Balance at end of period at Sep. 30, 2019 976,034   $ 2,846 1,072,768 (52,712)   (29,623) (17,245)
Balance at beginning of period (in shares) at Dec. 31, 2019     225,511          
Balance at beginning of period at Dec. 31, 2019 810,294 (321) $ 2,846 1,075,809 (220,805) (321) (30,298) (17,258)
Increase (Decrease) in Stockholders' Equity                
Net loss (85,978)       (85,978)      
Foreign currency translation adjustments 424           424  
Equity-based compensation expense 2,146     2,146        
Common shares issued upon vesting of share-based awards (in shares)     937          
Common shares issued upon vesting of share-based awards 0   $ 10 (10)        
Common shares issued for employee stock purchase plan (in shares)     126          
Common shares issued for employee stock purchase plan 552   $ 1 551        
Treasury shares withheld (in shares)     (293)          
Treasury shares withheld (1,056)             (1,056)
Share repurchase program (in shares)     (373)          
Share repurchase program (1,017)             (1,017)
Balance at end of period (in shares) at Mar. 31, 2020     225,908          
Balance at end of period at Mar. 31, 2020 725,044   $ 2,857 1,078,496 (307,104)   (29,874) (19,331)
Balance at beginning of period (in shares) at Dec. 31, 2019     225,511          
Balance at beginning of period at Dec. 31, 2019 810,294 $ (321) $ 2,846 1,075,809 (220,805) $ (321) (30,298) (17,258)
Increase (Decrease) in Stockholders' Equity                
Net loss (148,014)              
Foreign currency translation adjustments (262)              
Balance at end of period (in shares) at Sep. 30, 2020     226,179          
Balance at end of period at Sep. 30, 2020 668,443   $ 2,863 1,085,160 (369,140)   (30,560) (19,880)
Balance at beginning of period (in shares) at Mar. 31, 2020     225,908          
Balance at beginning of period at Mar. 31, 2020 725,044   $ 2,857 1,078,496 (307,104)   (29,874) (19,331)
Increase (Decrease) in Stockholders' Equity                
Net loss (34,245)       (34,245)      
Foreign currency translation adjustments (139)           (139)  
Equity-based compensation expense 3,515     3,515        
Common shares issued upon vesting of share-based awards (in shares)     229          
Common shares issued upon vesting of share-based awards 0   $ 3 (3)        
Treasury shares withheld (in shares)     (13)          
Treasury shares withheld (31)             (31)
Share repurchase program (in shares)     (197)          
Share repurchase program (480)             (480)
Balance at end of period (in shares) at Jun. 30, 2020     225,927          
Balance at end of period at Jun. 30, 2020 693,664   $ 2,860 1,082,008 (341,349)   (30,013) (19,842)
Increase (Decrease) in Stockholders' Equity                
Net loss (27,791)       (27,791)      
Foreign currency translation adjustments (547)           (547)  
Equity-based compensation expense 2,773     2,773        
Common shares issued upon vesting of share-based awards (in shares)     59          
Common shares issued upon vesting of share-based awards 0   $ 1 (1)        
Common shares issued for employee stock purchase plan (in shares)     215          
Common shares issued for employee stock purchase plan 382   $ 2 380        
Treasury shares withheld (in shares)     (22)          
Treasury shares withheld (38)             (38)
Balance at end of period (in shares) at Sep. 30, 2020     226,179          
Balance at end of period at Sep. 30, 2020 $ 668,443   $ 2,863 $ 1,085,160 $ (369,140)   $ (30,560) $ (19,880)