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Share-based compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Mar. 12, 2018
Sep. 06, 2017
Dec. 08, 2015
Nov. 16, 2015
Jan. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Apr. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share-based compensation expense             $ 6,648,000 $ 6,854,000  
Share-based compensation expense             $ 22,361,000 7,312,000  
Closing stock market price             $ 2.50    
Michael Brauser, Chairman of the Board [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated             2,500,000    
Accelerated share-based compensation expense             $ 6,468,000    
Annual base salary       $ 25,000          
Consulting services agreement effective date   Jun. 23, 2017              
Business consulting services agreement period   4 years              
Share-based compensation expense             302,000    
Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unrecognized share-based compensation costs in respect of granted RSUs             $ 15,781,000    
Unrecognized share-based compensation weighted average period             2 years    
Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 2,500,000                
Accelerated share-based compensation expense             $ 6,468,000    
Award vesting period       4 years          
RSU vesting condition             no portion of the RSUs shall vest unless and until the Company has met certain vesting conditions during the vesting period.    
Share units, granted       5,000,000          
Restricted share units, issued         1,250,000 1,250,000      
Restricted Stock Units [Member] | Stockholder Approval [Member] | Michael Brauser, Chairman of the Board [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares issuable upon exercise of restricted stock unit       5,000,000          
Employee Stock Option [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated             47,500    
Share-based compensation expense             $ 243,000 30,000  
Unrecognized share-based compensation cost with respect to granted share options             $ 0    
Restricted Stock Units, Common Stock Grants and Restricted Stock [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of restricted stock units outstanding           8,150,905 3,814,128    
Share units, granted [1]             4,293,125    
Share vested not delivered [2]             12,112,241    
Restricted stock units, common stock grants and restricted stock, compensation cost             $ 22,458,000 $ 7,528,000  
Marlin Capital Investments, LLC [Member] | Michael Brauser Managing                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Ownership percentage by Mike Brauser in Marlin Capital Investments LLC             50.00%    
Marlin Capital Investments, LLC [Member] | Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of restricted stock units outstanding             2,000,000    
Shares vested beginning date             Oct. 13, 2015    
Share-based compensation description             These RSUs vest annually beginning from October 13, 2015 only if certain performance goals of the Company are met. The shares underlying such RSUs will not be delivered until October 13, 2018, unless there is a change of control of the Company, termination of the agreement by the Company without cause, or termination of the agreement by Marlin Capital for good reason.    
Shares accelerated 500,000                
Accelerated share-based compensation expense             $ 906,000    
Share vested not delivered 500,000                
Frost Gamma [Member] | Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share units, granted     3,000,000            
Restricted share units, issued             3,000,000    
2015 Stock Incentive Plan [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of shares of common stock authorized for issuance             13,500,000    
Common stock reserved for future issuance             226,447    
2008 Stock Incentive Plan [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Common stock reserved for future issuance             310,568    
2018 Stock Incentive Plan [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of shares of common stock authorized for issuance , percentage                 10.00%
The Acceleration [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 5,157,998                
Accelerated share-based compensation expense $ 14,667,000                
The Acceleration [Member] | Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 4,960,498                
The Acceleration [Member] | Restricted Stock Units [Member] | Michael Brauser, Chairman of the Board [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 2,500,000                
The Acceleration [Member] | Employee Stock Option [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 47,500                
The Acceleration [Member] | Restricted Stock [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 150,000                
The Acceleration [Member] | Marlin Capital Investments, LLC [Member] | Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares accelerated 500,000                
Spin-off Grants [Member] | Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share units, granted             304,000    
Share vested not delivered             304,000    
Spin-off Grants [Member] | Restricted Stock Units [Member] | Vested Subject to Deferred Delivery [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share vested not delivered             2,041,000    
Spin-off Grants [Member] | Common Stock Grants [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share units, granted             304,000    
Share-based compensation expense             $ 881,000    
Transaction Grants [Member] | Common Stock Grants [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share-based compensation expense             $ 5,409,000    
Transaction Grants [Member] | Common Stock Grants [Member] | Vested Subject to Deferred Delivery [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share vested not delivered             2,041,000    
Shares vested period             3 years    
The Acceleration and Spin-off Grants [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Accelerated share-based compensation expense             $ 15,548,000    
[1] As discussed in “Spin-off of red violet” above, among the RSUs granted during the first quarter of 2018, there were an aggregate of 304,000 shares of Spin-off Grants that vested and were delivered in the current period, and an aggregate of 2,041,000 shares of Transaction Grants that vested but were subject to deferred delivery over a three-year period.
[2] Among the shares vested and delivered during the first quarter of 2018, there were 6,273,318 shares that were vested but deferred in prior periods. See Item (4) below.