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Condensed Consolidated Statements of Changes in Shareholders' Equity - 6 months ended Jun. 30, 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     12,178,136          
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units 1,979       $ 1,979      
Increase in treasury stock resulting from shares withheld to pay statutory taxes in connection with the vesting of restricted stock units, shares         872,562      
Share-based compensation 25,439         25,439    
Net loss (24,037)             (24,037)
Spin-off of red violet (41,500)         (41,500)    
Ending balance at Jun. 30, 2018 $ 195,322   $ 38   $ (3,253) $ 390,011   $ (191,474)
Ending balance, shares at Jun. 30, 2018     76,509,709   1,225,085