Share-based compensation - Summary of Restricted Shares Activities (Detail) - Restricted shares [Member] - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
2010 Plan
Number of restricted shares
Unvested at beginning of period	6,652,040	1,272,150	943,220
Granted	800,000	6,750,520	2,050,000
Vested	(1,296,540)	(267,630)	(115,125)
Forfeited	(971,000)	(1,103,000)	(1,605,945)
Unvested at end of period	5,184,500	6,652,040	1,272,150	943,220
Vested and expected to vest	4,406,825	5,654,234	1,081,327	801,737
Weighted-Average Grant-Date Fair Value
Weighted-Average Grant Date Fair Value, Granted	$ 0.81	$ 2.32	$ 0.69
2013 Plan
Number of restricted shares
Unvested at beginning of period	34,175	587,760	1,714,535
Vested	(27,475)	(525,140)	(996,835)
Forfeited	(6,700)	(28,445)	(129,940)
Unvested at end of period	34,175	34,175	587,760	1,714,535
Vested and expected to vest		29,049	499,596
2014 Plan
Number of restricted shares
Unvested at beginning of period	3,476,650	5,806,350	10,276,300
Vested	(1,318,450)	(2,086,450)	(2,447,950)
Forfeited	(837,000)	(243,250)	(2,022,000)
Unvested at end of period	1,321,200	3,476,650	5,806,350	10,276,300
Vested and expected to vest	1,123,020	2,955,153	4,935,398

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

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=116856206&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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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

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