Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.6.0.2
Employee Benefit Plan - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]      
Defined contribution plan, employer's matching contribution percent 50.00%    
Percentage of employer matching contribution to employee contribution 6.00% 6.00% 6.00%
Maximum percentage limit of employee contributions 6.00% 6.00% 6.00%
Defined contribution plan, maximum employer's contribution per employee $ 3,000 $ 3,000 $ 2,000
Aggregate employers contributions to defined contribution plan $ 300,000 $ 300,000 $ 200,000