Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Stock-Based Compensation - Plan Information (Details) - shares		3 Months Ended
	May 14, 2010	Mar. 31, 2019
2010 Plan
Stock-Based Compensation
Common stock authorized for issuance (in shares)	8,000,000	0
2010 Plan \| Minimum
Stock-Based Compensation
Vesting period	3 years
2010 Plan \| Maximum
Stock-Based Compensation
Vesting period	5 years
2016 Plan
Stock-Based Compensation
Common stock authorized for issuance (in shares)		9,500,000
2016 Plan \| Minimum
Stock-Based Compensation
Vesting period		1 year
2016 Plan \| Maximum
Stock-Based Compensation
Vesting period		4 years