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Share-based compensation - Summary of Restricted Shares Activities (Detail) - Restricted shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2010 share incentive plan [Member]
Number of restricted shares
Unvested at beginning of period	1,260,000	5,184,500	6,652,040
Granted			800,000
Vested	(400,000)	(965,500)	(1,296,540)
Forfeited	(210,000)	(2,959,000)	(971,000)
Unvested at end of period	650,000	1,260,000	5,184,500	6,652,040
Vested and expected to vest	552,500	1,071,000	4,406,825	5,654,234
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant Date Fair Value, Granted			$ 0.81
2013 Plan [Member]
Number of restricted shares
Unvested at beginning of period		34,175
Vested			(27,475)
Forfeited			(6,700)
Unvested at end of period			34,175
2014 Plan [Member]
Number of restricted shares
Unvested at beginning of period	26,000	1,321,200	3,476,650
Vested	(26,000)	(228,200)	(1,318,450)
Forfeited		(1,067,000)	(837,000)
Unvested at end of period	26,000	26,000	1,321,200	3,476,650
Vested and expected to vest		22,100	1,123,020
2020 Incentive Plan
Number of restricted shares
Granted	31,091,840
Vested	(2,429,965)
Forfeited	(2,777,500)
Unvested at end of period	25,884,375
Vested and expected to vest	19,413,281
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant Date Fair Value, Granted	$ 0.83

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Number

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