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

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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://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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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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 + References No definition available. + Details
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