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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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