Defined Contribution Plan (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Defined Contribution Minimum Age Requirement Of Eligible Employees	18 years
Maximum 401 (K) plan contribution rates as percentage of employees compensation	50.00%
Rate of contribution to 401(K) plan as a percentage of employees contribution	25.00%
Percentage of employee's earnings the company may contribute to the 401(k) plan	6.00%
Employer contribution to 401(k) plan	$ 0.1	$ 0.1	$ 0.1