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Condensed Consolidated Statements of Changes in Shareholders' Equity - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 | $ 229,649 | $ 27 | $ (531) | $ 344,384 | $ (114,231)
Beginning balance, shares at Dec. 31, 2016 |  | 53,717,996 | 160,235 |  |
Vesting of restricted stock units, shares |  | 722,341 |  |  |
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units, values | (168) |  | $ (168) |  |
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units, shares |  |  | 44,796 |  |
Share-based compensation expenses | 7,558 |  |  | 7,558 |
Net loss | (12,725) |  |  |  | (12,725)
Ending balance at Mar. 31, 2017 | $ 224,314 | $ 27 | $ (699) | $ 351,942 | $ (126,956)
Ending balance, shares at Mar. 31, 2017 |  | 54,440,337 | 205,031 |  |

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