401(k) Plan - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Employer's matching contribution percentage on first 6% contributed by employee to a defined contribution plan	100.00%
Maximum percentage of employee's earnings that the company may contribute to the defined contribution plan	6.00%
Defined benefit plan expense	$ 2.0	$ 1.2	$ 1.2