Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
Nov. 01, 2014	Dec. 31, 2016	Dec. 31, 2015
Postemployment Benefits [Abstract]
Employer matching contribution, percent of match	50.00%
Maximum annual contributions per employee, percent	6.00%
Employer contribution		$ 0.4	$ 0.2

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