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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Ordinary Shares | Additional Paid-in Capital | Treasury Stock | (Accumulated Deficit) | (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 90,992 | $ 8,563 | $ 122 | $ 1,263,006 | $ (8,374) | $ (1,226,173) | $ 8,563 | $ 62,411
Balance (in shares) at Dec. 31, 2017 |  |  | 35,506,366 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Repurchase or buyback of ordinary shares | $ (2,525) |  |  |  | (2,525) |  |  |
Repurchase or buyback of ordinary shares (in shares) | (623,765) |  | (623,765) |  |  |  |  |
Restricted stock issued and restricted stock units released | $ 1,097 |  |  | 1,097 |  |  |  |
Restricted stock issued and restricted stock units released (in shares) |  |  | 399,991 |  |  |  |  |
Ordinary shares issued upon option exercise | $ 80 |  | $ 1 | 79 |  |  |  |
Ordinary shares issued upon option exercise (in shares) |  |  | 35,150 |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201409Member |  |  |  |  |  |  |
Acquisition of non-controlling interests | $ (22) |  |  | (22) |  |  |  |
Net income (loss) | 4,820 |  |  |  |  | 4,820 |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Foreign currency translation | (839) |  |  |  |  |  |  | (839)
Balance at Dec. 31, 2018 | 102,166 |  | $ 123 | 1,264,160 | (10,899) | (1,212,790) |  | 61,572
Balance (in shares) at Dec. 31, 2018 |  |  | 35,317,742 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Repurchase or buyback of ordinary shares | $ (1,049) |  |  |  | (1,049) |  |  |
Repurchase or buyback of ordinary shares (in shares) | (328,856) |  | (328,856) |  |  |  |  |
Restricted stock issued and restricted stock units released | $ 1,399 |  |  | 1,399 |  |  |  |
Restricted stock issued and restricted stock units released (in shares) |  |  | 510,438 |  |  |  |  |
Ordinary shares issued upon option exercise | 56 |  |  | 56 |  |  |  |
Ordinary shares issued upon option exercise (in shares) |  |  | 25,000 |  |  |  |  |
Net income (loss) | (3,913) |  |  |  |  | (3,913) |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Foreign currency translation | 529 |  |  |  |  |  |  | 529
Balance at Dec. 31, 2019 | $ 99,188 |  | $ 123 | 1,265,615 | (11,948) | (1,216,703) |  | 62,101
Balance (in shares) at Dec. 31, 2019 | 35,525,000 |  | 35,524,324 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Repurchase or buyback of ordinary shares | $ (374) |  |  |  | (374) |  |  |
Repurchase or buyback of ordinary shares (in shares) | (199,331) |  | (199,331) |  |  |  |  |
Restricted stock issued and restricted stock units released | $ 703 |  |  | 703 |  |  |  |
Restricted stock issued and restricted stock units released (in shares) |  |  | 573,281 |  |  |  |  |
Net income (loss) | (23,676) |  |  |  |  | (23,676) |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Foreign currency translation | 1,560 |  |  |  |  |  |  | 1,560
Balance at Dec. 31, 2020 | $ 77,401 |  | $ 123 | $ 1,266,318 | $ (12,322) | $ (1,240,379) |  | $ 63,661
Balance (in shares) at Dec. 31, 2020 | 35,898,000 |  | 35,898,274 |  |  |  |  |

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