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Related party transactions (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 26, 2018
Mar. 12, 2018
Sep. 06, 2017
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 08, 2015
Related Party Transaction [Line Items]                  
Promissory notes, interest rate                 10.00%
Promissory notes                 $ 10,000
Payment of principal and accrued interest of long-term debt             $ 3,095 $ 67,982  
Share-based compensation expense             5,229 9,262  
Share-based compensation expense       $ 2,954 $ 2,614   $ 5,229 24,975  
Michael Brauser, Chairman of the Board                  
Related Party Transaction [Line Items]                  
Promissory notes                 4,000
Cash paid for interest               426  
Payment of principal and accrued interest of long-term debt $ 4,570                
Consultancy services agreement period     4 years            
Share-based compensation expense               302  
Shares accelerated (in shares)           2,500,000      
Share-based compensation expense           $ 6,468      
Another Investor                  
Related Party Transaction [Line Items]                  
Promissory notes                 1,000
Cash paid for interest               107  
Payment of principal and accrued interest of long-term debt 1,143                
Marlin Capital Investments, LLC                  
Related Party Transaction [Line Items]                  
Number of common stock shares to be received by RSU holder (in shares)             2,000,000    
Frost Gamma Investments Trust                  
Related Party Transaction [Line Items]                  
Promissory notes                 $ 5,000
Cash paid for interest               533  
Payment of principal and accrued interest of long-term debt $ 5,713                
Restricted Stock Units | Michael Brauser, Chairman of the Board                  
Related Party Transaction [Line Items]                  
Shares accelerated (in shares)   2,500,000              
Restricted Stock Units | Marlin Capital Investments, LLC                  
Related Party Transaction [Line Items]                  
Share-based compensation expense (Benefit)               $ 1,792  
Restricted share units, vested (in shares)           500,000      
Accelerated share-based compensation expense           $ 906      
Shares accelerated (in shares)   500,000