Subsequent Event - Additional Information (Detail) - BioPharma Credit Investments IV Sub, LP (“Pharmakon”) [Member] - Credit Agreement [Member] - Subsequent Event [Member] - USD ($)	Nov. 08, 2016	Nov. 09, 2016
Subsequent Event [Line Items]
Credit facility principal amount, minimum amount	$ 15,000,000
Credit facility principal amount, maximum amount	$ 25,000,000
Credit facility, expiration date	Mar. 15, 2017
Credit facility, annual interest rate	11.50%
Credit facility, optional future financing, description	In addition, the Credit Agreement grants Pharmakon an option during the two years following funding of the credit facility to participate in a future financing at an amount up to the lesser of 25% of the total amount financed or $50.0 million.
Credit facility, future financing, expiration period	2 years
Maximum percentage of participation in future financing	25.00%
Maximum dollar amount of participation in future financing	$ 50,000,000
Credit facility, amounts borrowed		$ 0