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Intangible assets, net - Schedule of Amortization Expense Recognized (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | $ 1,200 | $ 1,231 | $ 2,101
Cost of Revenue [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | 5 | 266 | 241
General and administrative expenses [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | 1,136 | 721 | 415
Research and development expenses [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense | $ 59 | $ 244 | $ 1,445

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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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