Summary of Significant Accounting Policies - Analysis of Different Types of Revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue from continuing operations      
Subscription revenue $ 82,435 $ 98,189 $ 86,733
Advertising revenue 4,802 5,834 2,951
Other internet value-added services [1] 42,759 31,789 32,347
Total $ 129,996 $ 135,812 $ 122,031
[1] Other internet value-added services mainly comprise revenue from online game, traffic referral programs, technical services regarding online acceleration, online sales revenue, sales of software licenses, and revenue from project crystal (including CDN revenue and revenue from ZQB).