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Property and equipment - Summary of Depreciation Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 7,948 | $ 6,165 | $ 5,646
Cost of Revenue [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 7,647 | 5,848 | 4,873
General and administrative expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 277 | 306 | 628
Sales and marketing expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 0 | 5 | 7
Research and Development Expense [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 24 | $ 6 | $ 8

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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