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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