Notes Payable - Additional Information (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
2014 Credit Facility [Member]
Line of Credit Facility [Line Items]
Additional final payment	$ 585,000	$ 585,000
Amended 2014 Credit Facility [Member]
Line of Credit Facility [Line Items]
Outstanding borrowings, Interest rate	8.25%	8.25%
Credit facility, Final payment percent of amounts drawn under the facility	3.75%	3.75%
Outstanding borrowings, Effective annual interest rate	10.60%	10.60%
Borrowing capacity under the agreement	$ 15,600,000	$ 15,600,000