Stock-Based Compensation - Summary of Unvested Option (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Unvested, options beginning balance	295,415
Granted, options	209,310
Vested, options	(101,955)
Unvested, options ending balance	402,770	295,415
Unvested , weighted average grant date fair value beginning balance	$ 13.59
Granted, weighted average grant date fair value	9.99	$ 15.41	$ 12.12
Vested, weighted average grant date fair value	12.95	5.66	$ 6.75
Unvested , weighted average grant date fair value ending balance	$ 11.88	$ 13.59