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Share-based compensation - Summary of Restricted Shares Activities (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2010 share incentive plan [Member] | Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Unvested, beginning balance	943,220	432,217
Number of restricted shares, Granted	2,050,000	1,170,000
Number of restricted shares, Vested	(115,125)	(274,960)
Number of restricted shares, Forfeited	(1,605,945)	(384,037)
Number of restricted shares, Unvested, Ending balance	1,272,150	943,220	432,217
Number of restricted shares, Vested and expected to vest, Ending balance	1,081,327	801,737
Weighted-Average Grant Date Fair Value, Granted	$ 0.69	$ 1.18
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Granted	8,664,980	8,664,980
2013 Plan [Member] | Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Unvested, beginning balance	1,714,535	3,796,398	7,200,778
Number of restricted shares, Vested	(996,835)	(1,520,760)	(2,627,815)
Number of restricted shares, Forfeited	(129,940)	(561,103)	(776,565)
Number of restricted shares, Unvested, Ending balance	587,760	1,714,535	3,796,398
Number of restricted shares, Vested and expected to vest, Ending balance	499,596	1,457,355	3,226,939
2014 Plan [Member] | Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares, Unvested, beginning balance	10,276,300	5,761,400
Number of restricted shares, Granted	0	6,749,000
Number of restricted shares, Vested	(2,447,950)	(1,262,200)
Number of restricted shares, Forfeited	(2,022,000)	(971,900)
Number of restricted shares, Unvested, Ending balance	5,806,350	10,276,300	5,761,400
Number of restricted shares, Vested and expected to vest, Ending balance	4,935,398	8,734,855
Weighted-Average Grant Date Fair Value, Granted	$ 0	$ 1.12

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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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X

- 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://www.xbrl.org/2003/role/presentationRef
-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=96867065&loc=d3e5070-113901

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

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