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Income taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Statutory federal income tax rate 34.00% 34.00% 34.00%
Operating Loss Carryforward expiration Year Will expire in 2034    
Increase in equity if deferred tax assets associated with share-based compensation expenses windfall realized $ 301,000    
Valuation allowance $ 1,881,000    
Percentage of tax benefits likelihood of being realized upon settlement of tax authority greater than 50%    
Discontinued Operations, Disposed of [Member] | Advertising Business [Member]      
Income Taxes [Line Items]      
Tax loss resulted from the the disposal of discontinued operation   $ 4,375,000  
Uncertain tax position, reduction in deferred tax assets   1,668,000  
Benefit for income taxes recognized for the loss   $ 0  
Accrued interest and penalties to uncertain tax positions $ 0    
Domestic Tax Authority [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards 22,682,000    
State and Local Jurisdiction [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards $ 18,566,000