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Contract liabilities and deferred income - Schedule of Contract liabilities and deferred income (Parenthetical) (Detail) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Contract Liabilities And Deferred Income [Line Items] |  |  |
Contract Liabilities |  | $ 32,611,000 | $ 30,189,000
Deferred revenue and income, non-current | [1] | 845,000 | 920,000
Membership subscription |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Contract Liabilities | [2] | 35,490,000 | 31,981,000
Deferred revenue and income, non-current |  | 845,000 | 751,000
Government grants |  |  |
Contract Liabilities And Deferred Income [Line Items] |  |  |
Deferred revenue and income, non-current |  | $ 0 | $ 169,000
[1] | As of December 31, 2020 and 2021, the non-current portion consists of membership subscription of USD751,000 and USD845,000, and government grants of USD169,000 and nil, respectively.
[2] | Contract liabilities were related to unsatisfied performance obligations at the end of the year. Due to the generally short-term duration of the contracts, the majority of the performance obligations are satisfied in the following period. The amount of revenue recognized that was included in contract liabilities balance at the beginning of the year was USD 30,189,000 and USD 32,611,000 for the years ended December 31, 2020 and 2021, 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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- Definition Amount of Contract Liabilities. + References No definition available. + 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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