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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 |  |  |  |  |

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