Employee Benefit Plans - Additional Information (Detail)	12 Months Ended
Dec. 31, 2016 USD ($)
Compensation and Retirement Disclosure [Abstract]
Maximum rate of employees' contribution to 401(k) plan	75.00%
Employer match percentage	200.00%
Employer matching contributions	$ 1,500

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