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Related party transactions - Additional Information (Detail) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 11, 2016 shares | Feb. 22, 2016 shares | Sep. 30, 2016 USD ($) Stockholder shares | Dec. 31, 2015 Stockholder shares | Dec. 08, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares issued |  |  | 50,724,856 | 15,709,786 |
Promissory note | $ |  |  |  |  | $ 10,000
Number of stockholders that the exchanged warrants were previously issued to | Stockholder |  |  |  | 4 |
Exchangeable Shares [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of common stock issued |  |  | 1,069,728 |  |
Number of stockholders that the exchanged warrants were previously issued to | Stockholder |  |  | 4 |  |
Michael Brauser, Executive Chairman of the Board [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Promissory note | $ |  |  |  |  | 4,000
Principal and accrued interest of promissory note | $ |  |  | $ 4,343 |  |
Another Investor [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Promissory note | $ |  |  |  |  | 1,000
Principal and accrued interest of promissory note | $ |  |  | 1,086 |  |
Series A Preferred Stock [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares issued upon conversion | 6,672,022 |  |  |  |
Number of shares converted | 6,672,022 |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares issued upon conversion |  | 22,548,100 |  |  |
Number of shares converted |  | 450,962 |  |  |
Ratio of conversion |  | 50 |  |  |
Frost Gamma Investments Trust [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Promissory note | $ |  |  |  |  | $ 5,000
Principal and accrued interest of promissory note | $ |  |  | $ 5,429 |  |
Frost Gamma Investments Trust [Member] | Exchangeable Shares [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of common stock issued |  |  | 524,750 |  |
Frost Gamma Investments Trust [Member] | Series B Preferred Stock [Member] | Previously Issued [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares converted |  | 141,430 |  |  |
Certain Investors [Member] | Series A Preferred Stock [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares issued upon conversion | 1,800,220 |  |  |  |
Ryan Schulke, Chief Executive Officer of Fluent [Member] | Series B Preferred Stock [Member] | Previously Issued [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares converted |  | 156,544 |  |  |
Matthew Conlin, President of Fluent [Member] | Series B Preferred Stock [Member] | Previously Issued [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares converted |  | 105,704 |  |  |
Earn-out Shares [Member] | Frost Gamma Investments Trust [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
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 |  |  |  |

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