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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)

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