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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common stock
Additional paid-in capital
Treasury stock
Retained deficit
Retained deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive income / (loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Adjustment for adoption of ASU $ 486,039 $ (1,398) $ 1,189 $ 1,231,650 $ (134,493) $ (503,369) $ (1,398) $ (108,938)
Beginning balance at Dec. 31, 2019 486,039 $ (1,398) 1,189 1,231,650 (134,493) (503,369) $ (1,398) (108,938)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Restricted stock issuance, net of forfeitures (189)   7 (196)        
Stock-based compensation expense 9,784     9,784        
Shares issued in employee stock purchase plan 346   2 344        
Treasury stock (6)       (6)      
Change in pension liability (700)             (700)
Currency translation adjustment 9,249             9,249
1-for-20 reverse stock split 0   (1,138) 1,138        
Net loss (96,889)         (96,889)    
Ending balance at Dec. 31, 2020 406,236   60 1,242,720 (134,499) (601,656)   (100,389)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Adjustment for adoption of ASU 406,236   60 1,242,720 (134,499) (601,656)   (100,389)
Restricted stock issuance, net of forfeitures (351)   1 (352)        
Stock-based compensation expense 7,594     7,594        
Treasury stock (1,063)       (1,063)      
Change in pension liability 840             840
Currency translation adjustment (1,479)             (1,479)
Net loss (82,651)         (82,651)    
Ending balance at Dec. 31, 2021 329,126   61 1,249,962 (135,562) (684,307)   (101,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Adjustment for adoption of ASU $ 329,126   $ 61 $ 1,249,962 $ (135,562) $ (684,307)   $ (101,028)