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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Treasury stock, at cost
Beginning balance (in shares) at Dec. 31, 2018   59,389,830        
Beginning balance at Dec. 31, 2018 $ 551,567 $ 59 $ 1,561,208 $ (10,621) $ (769,095) $ (229,984)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (27,514)       (27,514)  
Foreign currency translation adjustment (621)     (621)    
Exercise of Common Stock options, net (in shares)   68,259        
Exercise of Common Stock options, net 1,191   1,191      
Restricted stock units vested (in shares)   552,651        
Restricted stock units vested 4,611 $ 1 4,610      
Payments for taxes related to net share settlement of equity awards (in shares)   (52,853)        
Payments for taxes related to net share settlement of equity awards (1,138)   (1,138)      
Stock-based compensation 5,888   5,888      
Ending balance (in shares) at Mar. 31, 2019   59,957,887        
Ending balance at Mar. 31, 2019 533,938 $ 60 1,571,759 (11,242) (796,655) (229,984)
Beginning balance (in shares) at Dec. 31, 2019   70,065,130        
Beginning balance at Dec. 31, 2019 258,974 $ 70 1,609,358 (12,333) (1,108,137) (229,984)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (13,184)       (13,184)  
Foreign currency translation adjustment (2,873)     (2,873)    
Restricted stock units vested (in shares)   157,384        
Restricted stock units vested 0          
Payments for taxes related to net share settlement of equity awards (in shares)   (15,597)        
Payments for taxes related to net share settlement of equity awards (65)   (65)      
Stock-based compensation 2,609   2,609      
Ending balance (in shares) at Mar. 31, 2020   70,206,917        
Ending balance at Mar. 31, 2020 $ 245,461 $ 70 $ 1,611,902 $ (15,206) $ (1,121,321) $ (229,984)