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Share-based Payments - Summary of the activity for the options issued under the Share Award Scheme (Detail) - 2013 Share Award Scheme [Member] - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 21, 2019 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options - Outstanding |  | 37,191,840 |
Number of options - Forfeited |  | (1,241,600) |
Number of options - Exercised | 0 | (8,081,820) |
Number of options - Outstanding |  | 27,868,420 | 37,191,840
Number of options - Vested and expected |  | 27,868,420 |
Number of options - Exercisable |  | 12,566,340 |
Weighted- average exercise price - Outstanding |  | $ 0.82 |
Weighted- average exercise price - Forfeited |  | 0.87 |
Weighted- average exercise price - Exercised |  | 0.64 |
Weighted- average exercise price - Outstanding |  | 0.83 | $ 0.82
Weighted- average exercise price - Vested and expected |  | 0.83 |
Weighted- average exercise price - Exercisable |  | 0.80 |
Weighted- average grant- date fair value - Outstanding |  | 0.31 |
Weighted- average grant- date fair value - Forfeited |  | 0.30 |
Weighted- average grant- date fair value - Exercised |  | 0.33 |
Weighted- average grant- date fair value - Outstanding |  | 0.31 | $ 0.31
Weighted- average grant date fair value - Vested and expected |  | 0.31 |
Weighted- average grant- date fair value - Exercisable |  | $ 0.30 |
Weighted- average remaining contractual term - Outstanding |  | 7 years 11 months 26 days | 9 years
Weighted- average remaining contractual term - Vested and expected |  | 7 years 11 months 26 days |
Weighted- average remaining contractual term - Exercisable |  | 8 years |
Aggregate intrinsic value - Outstanding |  | $ 0.22 | $ 2.09
Aggregate intrinsic value - Vested and expected |  | 0.22 |
Aggregate intrinsic value - Exercisable |  | $ 0.25 |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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