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Condensed Consolidated Statements of Changes in Shareholders' Equity - 3 months ended Mar. 31, 2018 - USD ($)
$ in Thousands
Total
Certain Investors [Member]
Common Stock [Member]
Common Stock [Member]
Certain Investors [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Certain Investors [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2017 $ 224,007   $ 31   $ (1,274) $ 392,687   $ (167,437)
Beginning balance, shares at Dec. 31, 2017     61,631,573   352,523      
Issuance of common stock upon a direct offering to certain investors, net of issuance costs of $108   $ 13,392   $ 1     $ 13,391  
Issuance of common stock upon a direct offering to certain investors, net of issuance costs of $108, shares       2,700,000        
Vesting of restricted stock units and issuance of restricted stock     $ 6     (6)    
Vesting of restricted stock units and issuance of restricted stock, shares     12,105,636          
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units 398       $ 398      
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units, shares         143,395      
Share-based compensation 22,701         22,701    
Net loss (26,682)             (26,682)
Spin-off of red violet (41,500)         (41,500)    
Ending balance at Mar. 31, 2018 $ 191,520   $ 38   $ (1,672) $ 387,273   $ (194,119)
Ending balance, shares at Mar. 31, 2018     76,437,209   495,918