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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | (Accumulated Deficit) | Accumulated Other Comprehensive Income | Non-controlling interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 83,777 | $ 122 | $ 1,259,767 | $ (4,138) | $ (1,233,444) | $ 61,470 | $ 0
Balance (in shares) at Dec. 31, 2015 |  | 36,735,314 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Repurchase of ordinary shares | (4,096) |  |  | (4,096) |  |  |
Repurchase of ordinary shares (in shares) |  | (2,054,655) |  |  |  |  |
Restricted stock issued and restricted stock units released | 0 |  |  |  |  |  |
Restricted stock issued and restricted stock units released (in shares) |  | 543,894 |  |  |  |  |
Stock-based compensation | 2,238 |  | 2,238 |  |  |  |
Net income | 132 |  |  |  | 290 |  | (158)
Acquisition of non-controlling interests | 158 |  |  |  |  |  | 158
Other comprehensive income: |  |  |  |  |  |  |
Foreign currency translation | 570 |  |  |  |  | 570 |
Recognition due to closure of the subsidiaries | (38) |  |  |  |  | (38) |
Balance at Dec. 31, 2016 | 82,741 | $ 122 | 1,262,005 | (8,234) | (1,233,154) | 62,002 | $ 0
Balance (in shares) at Dec. 31, 2016 |  | 35,224,553 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Repurchase of ordinary shares | (140) |  |  | (140) |  |  |
Repurchase of ordinary shares (in shares) |  | (72,739) |  |  |  |  |
Restricted stock issued and restricted stock units released | 866 |  | 866 |  |  |  |
Restricted stock issued and restricted stock units released (in shares) |  | 302,886 |  |  |  |  |
Common stock issued upon option exercise | 135 | $ 0 | 135 |  |  |  |
Common stock issued upon option exercise (in shares) |  | 51,666 |  |  |  |  |
Net income | 6,981 |  |  |  | 6,981 |  |
Other comprehensive income: |  |  |  |  |  |  |
Foreign currency translation | 2,112 |  |  |  |  | 2,112 |
Recognition due to closure of the subsidiaries | (1,703) |  |  |  |  | (1,703) |
Balance at Dec. 31, 2017 | $ 90,992 | $ 122 | 1,263,006 | (8,374) | (1,226,173) | 62,411 |
Balance (in shares) at Dec. 31, 2017 | 35,506,000 | 35,506,366 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Repurchase of ordinary shares | $ (2,525) |  |  | (2,525) |  |  |
Repurchase of ordinary shares (in shares) |  | (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 |  |  |  |  |
Common stock issued upon option exercise | 80 | $ 1 | 79 |  |  |  |
Common stock issued upon option exercise (in shares) |  | 35,150 |  |  |  |  |
Cumulative effect of change in revenue recognition accounting principle | 8,563 |  |  |  | 8,563 |  |
Acquisition of non-controlling interests | (22) |  | (22) |  |  |  |
Net income | 4,820 |  |  |  | 4,820 |  |
Other comprehensive income: |  |  |  |  |  |  |
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 | 35,318,000 | 35,317,742 |  |  |  |  |

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