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Condensed Consolidated Statements of Changes in Shareholders' Equity - 6 months ended Jun. 30, 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 |  | $ 1 |  | (1) |
Vesting of restricted stock units, shares |  | 1,810,098 |  |  |
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units | (723) |  | $ (723) |  |
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units, shares |  |  | 187,767 |  |
Share-based compensation expenses | 17,212 |  |  | 17,212 |
Net loss | (33,134) |  |  |  | (33,134)
Ending balance at Jun. 30, 2017 | $ 213,004 | $ 28 | $ (1,254) | $ 361,595 | $ (147,365)
Ending balance, shares at Jun. 30, 2017 |  | 55,528,094 | 348,002 |  |

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