Annual report pursuant to Section 13 and 15(d)

Retirement Plan - Additional Information (Detail)

v3.6.0.2
Retirement Plan - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Employer matching contribution percentage 3.00%  
Total matching contributions $ 33,237 $ 24,634