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Share-Based Compensation - 2014 Restricted Shares plan (Detail) - 2014 Restricted Share Plan - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Weighted Average Grant Date Fair Value |  |
Granted (in dollars per share) | $ 0.78 | $ 1.13
Restricted shares with an option feature |  |
Number of shares |  |
Outstanding at the beginning of the year | 50,865,930 |
Granted | 13,848,890 |
Forfeited | (26,612,224) |
Exercised | (8,277,510) |
Outstanding at the end of the year | 29,825,086 | 50,865,930
Vested and expected to vest at end of year | 29,825,086 |
Exercisable | 4,109,262 |
Weighted Average Exercise Price |  |
Outstanding at the beginning of the year (in dollars per share) | $ 0.31 |
Granted (in dollars per share) | 0.34 |
Forfeited (in dollars per share) | 0.31 |
Exercised (in dollars per share) | 0.28 |
Outstanding at the end of the year (in dollars per share) | 0.33 | $ 0.31
Weighted Average Grant Date Fair Value |  |
Outstanding at beginning of year (in dollars per share) | 1.37 |
Granted (in dollars per share) | 0.78 |
Forfeited (in dollars per share) | 1.20 |
Exercised (in dollars per share) | 1.50 |
Outstanding at end of year (in dollars per share) | $ 1.22 | $ 1.37
Weighted Average Remaining Contractual Term |  |
Outstanding | 6 years 3 months 22 days | 7 years 3 months 22 days
Aggregate Intrinsic Value |  |
Outstanding at the beginning of the year | $ 32,839 |
Outstanding at the end of the year | $ 26,064 | $ 32,839
Risk-free interest rates, minimum | 2.81% |
Risk-free interest rates, maximum | 2.99% |
Expected volatility range, minimum | 55.90% |
Expected volatility range, maximum | 58.00% |
Expected dividend yield | 0.00% |
Expected exercise multiple | 2.2 |
Restricted shares with an option feature | Minimum [Member] |  |
Aggregate Intrinsic Value |  |
Fair value of ordinary share | $ 0.84 |
Fair value per option granted | 0.55 |
Restricted shares with an option feature | Maximum [Member] |  |
Aggregate Intrinsic Value |  |
Fair value of ordinary share | 1.21 |
Fair value per option granted | $ 0.93 |

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- Definition The weighted average fair value of outstanding awards on share incentive plans. + References No definition available. + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -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 Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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