Stock-Based Compensation and Employee Benefit Plan - Employee Benefit Plan (Details)	9 Months Ended
Sep. 30, 2018
Compensation Related Costs [Abstract]
Defined benefit plan, maximum percentage of eligible compensation deferred	60.00%

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration