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Share-Based Compensation - Assumptions to estimate the fair value of options (Details) - Stock Options - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-Based Compensation |  |  |
Risk-free interest rate, minimum (in percent) | 1.50% | 2.97% | 2.26%
Risk-free interest rate, maximum (in percent) | 2.90% | 3.13% | 2.57%
Expected volatility, minimum (in percent) | 43.52% | 46.23% | 48.08%
Expected volatility, maximum (in percent) | 57.59% | 48.63% | 49.35%
Expected dividend yield (in percent) | 0.00% | 0.00% | 0.00%
Exercise multiple | 2.80 | 2.80 | 2.80
Post-vesting forfeit rate | 0.00% | 0.00% | 0.00%
Fair value of underlying Ordinary Share, minimum (in dollars per share) | $ 4.8550 | $ 1.5146 | $ 0.0858
Fair value of underlying Ordinary Share, maximum (in dollars per share) | 8.9875 | 5.7400 | 0.5359
Fair value of share option, minimum | 4.8485 | 1.5091 | 0.0808
Fair value of share option, maximum | $ 8.9810 | $ 5.7335 | $ 0.5302

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- Definition Represents the exercise multiple which is estimated as the ratio of fair value of underlying shares over the exercise price as at the time the option is exercise. + References No definition available. + Details
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- Definition The maximum grant-date fair value of share options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The minimum grant-date fair value of share options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The minimum grant-date fair value of underlying shares of award granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The maximum grant-date fair value of underlying shares of award granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value. + 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 (f)(2)(v) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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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- Definition The estimated measure of the minimum 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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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + 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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