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 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.

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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.

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- Definition

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

+ References

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

+ References

No definition available.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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.

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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
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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Stock-Based Compensation - Schedule of Fair Value Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)			6 years 3 months 18 days
Expected volatility rate, minimum		36.60%
Expected volatility rate, maximum		38.70%
Expected volatility			37.10%
Risk free interest rate, minimum		2.80%	2.00%
Risk free interest rate, maximum		2.90%	2.30%
Dividend yield		0.00%	0.00%
Service and Market-Based Options and RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	10 years
Expected volatility rate, minimum		60.00%
Expected volatility rate, maximum		64.00%
Expected volatility	59.00%
Risk-free interest rate	2.80%
Risk free interest rate, minimum		2.60%
Risk free interest rate, maximum		2.90%
Dividend yield	0.00%	0.00%
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	9 months 7 days
Expected volatility	50.60%
Risk-free interest rate	1.90%
Dividend yield	0.00%
Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)		6 years
Minimum \| Service and Market-Based Options and RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)		9 years 7 months 6 days
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)		6 years 9 months 18 days
Maximum \| Service and Market-Based Options and RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)		10 years