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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, 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, 2020     226,325          
Balance at beginning of period at Dec. 31, 2020 661,249   $ 2,866 1,087,733 (377,346)   (31,966) (20,038)
Increase (Decrease) in Stockholders' Equity                
Net loss (23,886)       (23,886)      
Foreign currency translation adjustments 1,716           1,716  
Equity-based compensation expense 2,872     2,872        
Common shares issued upon vesting of share-based awards (in shares)     1,717          
Common shares issued upon vesting of share-based awards 0   $ 21 (21)        
Common shares issued for employee stock purchase plan (in shares)     238          
Common shares issued for employee stock purchase plan 447   $ 3 444        
Treasury shares withheld (in shares)     (568)          
Treasury shares withheld (1,900)             (1,900)
Balance at end of period (in shares) at Mar. 31, 2021     227,712          
Balance at end of period at Mar. 31, 2021 $ 640,498   $ 2,890 $ 1,091,028 $ (401,232)   $ (30,250) $ (21,938)