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Related party transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 06, 2017
Mar. 11, 2016
Feb. 22, 2016
Dec. 08, 2015
Nov. 16, 2015
Aug. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 21, 2015
Related Party Transaction [Line Items]                    
Common stock, shares issued             61,631,573 53,717,996    
Share-based compensation expense             $ 33,996 $ 29,249 $ 34,160  
Number of Series B Preferred Stock issued for every $1.0 million promissory note             0 0    
Promissory notes, interest rate       10.00%     10.00%      
Promissory notes       $ 10,000            
Principal and accrued interest of long-term debt             $ 62,963 $ 50,013    
Cash paid for interest             6,706 3,795 3  
Share-based compensation expenses             33,996 29,249 34,616  
Securities Purchase Agreement [Member]                    
Related Party Transaction [Line Items]                    
Number or of warrants to purchase common stock         749,625          
Certain Investors [Member]                    
Related Party Transaction [Line Items]                    
Gross proceeds from preferred stock and warrants issued in relation to $10.0 million Securities Purchase Agreement         $ 10,000          
Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Number or of warrants to purchase common stock         524,750          
Number of Series B Preferred Stock issued for every $1.0 million promissory note         20,990          
Exercise price of warrants         $ 6.67          
Restricted Stock Units [Member] | Frost Gamma [Member]                    
Related Party Transaction [Line Items]                    
Restricted share units, granted       3,000,000            
DAB Management Group Inc. [Member]                    
Related Party Transaction [Line Items]                    
Consulting service fee payable           $ 20 240 $ 240 100  
Exchangeable Shares [Member]                    
Related Party Transaction [Line Items]                    
Number of common stock issued               1,069,728    
Number of common stock shares that warrants to purchase               320,102    
Michael Brauser, Chairman of the Board [Member]                    
Related Party Transaction [Line Items]                    
Number of Series B Preferred Stock issued for every $1.0 million promissory note       400            
Promissory notes       $ 4,000            
Principal and accrued interest of long-term debt             4,460 $ 4,453    
Cash paid for interest             426      
Business consulting services agreement period 4 years                  
Consulting services agreement effective date Jun. 23, 2017                  
Share-based compensation expenses             1,742      
Another Investor [Member]                    
Related Party Transaction [Line Items]                    
Number of Series B Preferred Stock issued for every $1.0 million promissory note       100            
Promissory notes       $ 1,000            
Principal and accrued interest of long-term debt             1,115 1,113    
Cash paid for interest             107      
Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Number of Shares owned                   2,144,275
Ownership percentage                   29.40%
Common stock, shares issued                   2,660,309
Issuance of additional shares subject to earn out                   900,108
Number of Series B Preferred Stock issued for every $1.0 million promissory note       500            
Promissory notes       $ 5,000            
Principal and accrued interest of long-term debt             5,574 $ 5,566    
Cash paid for interest             $ 533      
Frost Gamma Investments Trust [Member] | Exchangeable Shares [Member]                    
Related Party Transaction [Line Items]                    
Number of common stock issued               524,750    
Certain Investors [Member]                    
Related Party Transaction [Line Items]                    
Exercise price of warrants             $ 3.00      
Number of common stock shares that warrants to purchase             1,161,769      
Affiliated Entity [Member]                    
Related Party Transaction [Line Items]                    
Aircraft lease fee             $ 85 $ 216 94  
Marlin Capital Investments, LLC [Member]                    
Related Party Transaction [Line Items]                    
Number of common stock shares to be received by RSU holder             2,000,000      
Marlin Capital Investments, LLC [Member] | Restricted Stock Units [Member]                    
Related Party Transaction [Line Items]                    
Shares vested beginning date             Oct. 13, 2015      
Share-based compensation expense             $ 4,272 $ 1,252 1,512  
Frost Gamma [Member] | Restricted Stock Units [Member]                    
Related Party Transaction [Line Items]                    
Share-based compensation expense                 $ 25,350  
Restricted share units, granted       3,000,000            
Initial Closing [Member] | Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Ownership percentage                   34.60%
Earn-out Shares [Member] | Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Ownership percentage                   38.60%
Common stock, shares issued   900,108                
Series A Earn-out Shares [Member] | Certain Investors [Member]                    
Related Party Transaction [Line Items]                    
Common stock, shares issued   1,800,220                
Series A Earn-out Shares [Member] | Grander Holdings, Inc. [Member]                    
Related Party Transaction [Line Items]                    
Common stock, shares issued   567,069                
TBO Common Stock [Member] | Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Number of shares owned prior to merger                   80,000
TBO Series C Preferred Stock [Member] | Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Number of shares owned prior to merger                   640,000
TBO Series D Preferred Stock [Member] | Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Number of shares owned prior to merger                   4,000
Series A Preferred Stock [Member]                    
Related Party Transaction [Line Items]                    
Preferred stock conversion basis   One-for-one basis                
Preferred stock to be converted   6,672,022                
Series A Preferred Stock [Member] | Certain Investors [Member]                    
Related Party Transaction [Line Items]                    
Common stock, shares issued upon conversion   1,800,220                
Series B Preferred Stock [Member]                    
Related Party Transaction [Line Items]                    
Number of Series B Preferred Stock issued for every $1.0 million promissory note       100            
Common stock, shares issued upon conversion     22,548,100 50            
Preferred stock to be converted     450,962              
Ratio of conversion     50              
Series B Preferred Stock [Member] | Frost Gamma Investments Trust [Member]                    
Related Party Transaction [Line Items]                    
Gross proceeds from preferred stock and warrants issued in relation to $10.0 million Securities Purchase Agreement         $ 7,000          
Preferred stock shares sold under $40.0 million stock purchase agreement         119,940          
Proceeds from sale of preferred stock         $ 40,000          
Preferred stock conversion basis         Each share of Series B Preferred automatically converted into 50 shares of common stock in 2016.          
Common stock, shares issued upon conversion     50              
Series B Preferred Stock [Member] | Frost Gamma Investments Trust [Member] | Previously Issued [Member]                    
Related Party Transaction [Line Items]                    
Preferred stock to be converted     141,430              
Series B Preferred Stock [Member] | Ryan Schulke, Chief Executive Officer of Fluent [Member] | Previously Issued [Member]                    
Related Party Transaction [Line Items]                    
Preferred stock to be converted     156,544              
Series B Preferred Stock [Member] | Matthew Conlin, President of Fluent [Member] | Previously Issued [Member]                    
Related Party Transaction [Line Items]                    
Preferred stock to be converted     105,704              
Series B Preferred Stock [Member] | Frost Gamma [Member] | Securities Purchase Agreement [Member]                    
Related Party Transaction [Line Items]                    
Preferred stock shares sold under $40.0 million stock purchase agreement         29,985