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Cost of revenues - Schedule of Cost of Revenues (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | $ 117,876 | $ 79,928 | $ 59,250
Bandwidth costs [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | 68,441 | 55,135 | 37,218
Payment handling fees [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | 4,855 | 6,919 | 8,909
Depreciation of servers and other equipment [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | 7,647 | 5,848 | 4,873
Cost Of Inventories Sold [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | 21,485 | 4,357 | 2,621
Cost Of Live Video [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | 12,724 | 2,505 | 204
Other Cost Of Reveue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Cost of revenues | $ 2,724 | $ 5,164 | $ 5,425

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- Definition The aggregate cost of goods produced and sold and 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 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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