Retirement Plan - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Matching contributions by employer	4.00%
Employer matching contribution, vesting period	1 year
Section 401(k) plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Total contributions	$ 0.6