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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