Share-based Compensation - Schedule of Assumptions Used to Estimate Fair Values of Share Options Granted (Details) - $ / shares	1 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2017	May 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free rate of return			3.50%	3.20%
Risk-free rate of return	1.60%	2.70%
Risk-free rate of return	2.50%	3.20%
Contractual life of option	10 years	10 years	10 years	10 years
Expected term		6 years 6 months
Estimated volatility rate	70.00%	70.00%	70.00%	70.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Fair value of underlying ordinary shares			$ 27.93	$ 9.60
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	6 years
Fair value of underlying ordinary shares	$ 27.23	$ 17.60
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term	6 years 6 months
Fair value of underlying ordinary shares	$ 41.59	$ 24.58

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

No definition available.

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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.

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- Definition

The estimated measure of the 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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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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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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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- Definition

Share based compensation arrangement by share based payment award fair value assumptions expected term.

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