Stock-Based Compensation (Details) - shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Evergreen annual % increase	5.00%
Stock Option
Number of Shares
Vesting period	4 years
Award vesting rights, percentage	25.00%
Restricted awards
Number of Shares
Award vesting rights, percentage	25.00%
Equity plans other than ESPP
Number of Shares
Number of shares available for grant	3,780,447
Two Year RSUs \| Unvested restricted stock units
Number of Shares
Award vesting rights, percentage	50.00%	50.00%
RSUs granted (in shares)	1,800,000	2,800,000

Evergreen Annual % Increase

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Net number of non-option equity instruments granted to participants.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of award under share-based payment arrangement.

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