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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.

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