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Share-based compensation - Summary of Restricted Shares Activities (Detail) - $ / shares | 12 Months Ended
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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 |

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- 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 + Details
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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 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 + Details
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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://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 + Details
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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 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 + Details
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- 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 + 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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