Accrued Expenses and Other - Schedule of Accrued Expenses and Other (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Payroll	$ 1,643	$ 1,495
Professional fees	1,074	952
Clinical studies	740	124
Other	1,814	859
Total	$ 5,271	$ 3,430