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Condensed Consolidated Statements of Changes in Shareholders' Equity - 9 months ended Sep. 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 and issuance of restricted stock |  | $ 1 |  | (1) |
Vesting of restricted stock units and issuance of restricted stock, shares |  | 2,700,140 |  |  |
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units | (743) |  | $ (743) |  |
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units, shares |  |  | (192,288) |  |
Share-based compensation | 28,704 |  |  | 28,704 |
Net loss | (47,229) |  |  |  | (47,229)
Ending balance at Sep. 30, 2017 | $ 210,381 | $ 28 | $ (1,274) | $ 373,087 | $ (161,460)
Ending balance, shares at Sep. 30, 2017 |  | 56,418,136 | 352,523 |  |

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