Defined Contribution Benefit Plan - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employer-matching contribution (percent)			50.00%
Employer matching contribution, percent of employee's gross pay			6.00%
Employees initial service period (years)			5 years
401(k) Employer matching contribution, percent match, first 3%	100.00%
401(k) Employer matching contribution, percent match, remaining 2%	50.00%
Contributions of eligible employee pretax salary (percent) (up to)	100.00%
Annual deferral limit	$ 18,000	$ 18,000
Amount of employer contributions during period	$ 1,000,000	$ 400,000