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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Treasury stock
Retained deficit
Accumulated other comprehensive income / (loss)
Balance at beginning of period at Dec. 31, 2021 $ 329,126 $ 61 $ 1,249,962 $ (135,562) $ (684,307) $ (101,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 2,151   2,151      
Restricted stock issuance, net of forfeitures (360) 1 (361)      
Currency translation adjustment (6,992)         (6,992)
Change in pension liability 30         30
Net loss (9,199)       (9,199)  
Balance at end of period at Mar. 31, 2022 314,756 62 1,251,752 (135,562) (693,506) (107,990)
Balance at beginning of period at Dec. 31, 2022 307,035 62 1,253,613 (138,560) (680,595) (127,485)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 841   841      
Restricted stock issuance, net of forfeitures (1,873) 1 (1,874)      
Conversion of debt to common stock 113,650 46 113,604      
Treasury stock (3,497)     (3,497)    
Currency translation adjustment 4,158         4,158
Change in pension liability 15         15
Net loss (3,486)       (3,486)  
Balance at end of period at Mar. 31, 2023 $ 416,843 $ 109 $ 1,366,184 $ (142,057) $ (684,081) $ (123,312)