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Property and equipment, net - Summary of Depreciation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 6,319 | $ 9,277 | $ 5,824
Cost of revenues. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 4,805 | 6,247 | 5,198
Research and development expenses |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 436 | 529 | 300
General and administrative expenses |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 1,068 | 2,492 | 317
Sales and marketing expenses |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 10 | $ 9 | $ 9

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + 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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