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Cost of revenues - Schedule of cost of revenuues (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | $ 92,637 | $ 99,913 | $ 115,667
Bandwidth costs [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | 62,384 | 57,093 | 48,118
Cost of inventories sold [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | 1,660 | 7,181 | 31,634
Cost of live streaming [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | 15,640 | 20,734 | 23,928
Depreciation of servers and other equipment [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | 6,247 | 5,198 | 5,018
Payment handling charges [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | 1,459 | 1,658 | 3,016
Other Cost of revenues [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Cost of revenues | $ 5,247 | $ 8,049 | $ 3,953

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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