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Summary of significant accounting policies - Analysis of Different Types of Revenues (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from continuing operations |  |  |  |
Subscription revenue |  | $ 84,956 | $ 90,163 | $ 82,435
Advertising revenue |  | 22,484 | 16,874 | 4,802
Product revenue (note a) |  | 32,894 | 4,543 | 2,512
Other internet value-added services (note b) | [1] | 61,577 | 29,405 | 15,088
Total |  | $ 201,911 | $ 140,985 | $ 104,837
[1] | Other internet value-added services mainly comprise of CDN revenue, live video services, provision of technical services, traffic referral programs, and online game revenue.

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- Definition Revenue from the sale of advertising time (such as television and radio) or space (newspaper or magazine pages). May also include advertising, marketing and promotional services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- References No definition available. + Details
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- Definition Revenue from circulation or sale of subscriptions (for example, but not limited to, subscriptions to a magazine or newspaper). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition It represents Product revenue during the period. + References No definition available. + Details
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- Definition The represents the amount of sale revenue net. + References No definition available. + Details
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