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Summary of Significant Accounting Policies - Share-Based Compensation (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Number of days prior to the grant that common stock and restricted stock units fair value is determined based on	3 days
Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001

X

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The number of days prior to the grant that common stock and restricted stock units fair value is determined based on.

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