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Summary of significant accounting policies - Additional Information (Detail) - USD ($)
 12 Months Ended 18 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 15, 2017
Dec. 31, 2014
Accounting Policies and General Information [Line Items]          
Allowance for doubtful accounts $ 31,000 $ 119,000 $ 126,000   $ 131,000
Impairment of long-term investments 596,000    
Goodwill impairment losses 0 0      
Sales rebates provided to the agencies and advertisers 440,000 15,000 1,179,000    
Net gains from barter transactions     137,000    
Net proceeds from barter transactions     409,000    
Barter transaction cost     247,000    
Business tax and surcharge on barter transactions     25,000    
External advertising and market promotion expenses from continuing operations $ 10,345,000 6,666,000 6,019,000    
Value added tax on revenues 17.00%        
Value added tax on sub-licensing revenues 6.00%        
Employee benefit costs $ 10,123,000 $ 8,645,000 $ 5,176,000    
Statutory general reserve rate 10.00%        
Statutory general reserve rate of registered capital 50.00%        
Dividends declared $ 0 $ 0 $ 0    
Income (Loss) from Equity Method Investments $ (1,875,000) [1] $ (195,000) [1] $ (12,000)    
Impairment of Intangible Assets, Finite-lived 4,833,000    
Disposal Group, Including Discontinued Operation, Revenue 11,428,000 15,981,000 25,160,000    
Advertising Revenue 22,484,000 16,874,000 4,802,000    
Beijing Millet Technology Co., Ltd. [Member]          
Accounting Policies and General Information [Line Items]          
Advertising Revenue       $ 5,800,000  
Non Compete Agreement [Member]          
Accounting Policies and General Information [Line Items]          
Impairment of Intangible Assets, Finite-lived 322,000        
Related Technology [Member]          
Accounting Policies and General Information [Line Items]          
Impairment of Intangible Assets, Finite-lived 1,381,000        
Trademarks [Member]          
Accounting Policies and General Information [Line Items]          
Impairment of Intangible Assets, Finite-lived 3,232,000        
Big Data [Member]          
Accounting Policies and General Information [Line Items]          
Income (Loss) from Equity Method Investments 1,300,000        
Online game licenses [Member]          
Accounting Policies and General Information [Line Items]          
Impairment of intangible assets $ 765,000 $ 721,000 $ 770,000    
Domain name [Member]          
Accounting Policies and General Information [Line Items]          
Other intangible assets, amortization period 5 years        
Land use right [Member]          
Accounting Policies and General Information [Line Items]          
Other intangible assets, amortization period 30 years        
[1] In 2016, the Group made an equity investment in a privately-held company, Big Data, of USD 1,442,000 for 43.16% equity interest. The Group classified Big Data as an equity method investment as it had only significant influence instead of control over Big Data. In January of 2017, Big Data issued certain new shares to a third party and its original shareholders and the Group’s interest in Big Data diluted from 43.16% to 28.77% with a dilution gain of USD 326,000 arising from the deemed disposal. As at December 31, 2017, the Group recognized full impairment of USD 1,251,000 for its interest in Big Data as share of loss from equity investees after taking into account the latest operation status and financial position of Big Data.