Number of Board Members with Modified Option Grants

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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

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

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

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- Definition

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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
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Equity - Modification of Stock Options (Details)	12 Months Ended
Equity - Modification of Stock Options (Details)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) director shares	Dec. 31, 2018 USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Share-based compensation expense \| $	$ 15,357,000	$ 12,064,000	$ 14,768,000
Modified Stock Option
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Share-based compensation expense \| $		$ 400,000
Contractual term of equity grant (in years)	10 years
2019 Option Modification
Expected dividend yield	0.00%
Modified Stock Option \| Minimum
2019 Option Modification
Expected volatility	65.00%
Expected life (in years)	3 months 10 days
Risk-free interest rate	1.56%
Modified Stock Option \| Maximum
2019 Option Modification
Expected volatility	95.00%
Expected life (in years)	5 years 1 month 13 days
Risk-free interest rate	2.02%
Members of the Board \| Modified Stock Option
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Fully vested options (in shares) \| shares		612,000
Number of Board Members with Modified Option Grants \| director		7
Former Employee \| Modified Stock Option
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Fully vested options (in shares) \| shares		278,916