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Contract liabilities and deferred income - Schedule of Contract liabilities and deferred income (Parenthetical) (Detail) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Contract Liabilities And Deferred Income [Line Items] |  |  |
Contract Liabilities |  | $ 30,189,000 | $ 26,911,000
Deferred revenue and income, non-current | [1] | 920,000 | 1,223,000
Membership subscription [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Deferred revenue and income, non-current |  | 751,000 | 781,000
Government grants [Member] |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Deferred revenue and income, non-current |  | $ 169,000 | $ 442,000
[1] | As of December 31, 2019 and 2020, the non-current portion consists of membership subscription of USD 781,000 and USD 751,000, and government grants of USD 442,000 and USD 169,000, respectively.

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of Contract Liabilities. + References No definition available. + Details
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Balance Type: | credit
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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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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |