Stockholders' Deficit - Restricted Stock Units - Additional Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unrecognized stock compensation expense	$ 29.3
Expected weighted average period to recognize unrecognized stock compensation expense	2 years 6 months
Restricted Stock Units
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unrecognized stock compensation expense	$ 19.7
Expected weighted average period to recognize unrecognized stock compensation expense	3 years 8 months 12 days
Restricted stock units vested during the period \| shares	0

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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