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Intangible assets, net - Schedule of Amortization Expense Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | $ 2,101 | $ 2,063 | $ 2,122
Cost of Revenues [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | 241 | 243 | 147
General and administrative expenses [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | 415 | 323 | 386
Research and development expenses [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | $ 1,445 | $ 1,497 | $ 1,589

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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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- Definition Represents the aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets from continuing operations. + References No definition available. + Details
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