Subsequent Event - Additional Information (Detail) - USD ($)						1 Months Ended			3 Months Ended	12 Months Ended
	Mar. 21, 2016	Mar. 07, 2016	Dec. 15, 2015	Sep. 28, 2015	Sep. 15, 2015	Mar. 23, 2016	Feb. 29, 2016	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2015
Subsequent Event [Line Items]
Non-recourse notes issued								$ 45,000,000		$ 45,000,000
Number of common shares, callable by warrants issued in the aggregate stock and warrants sale								345,661	345,661	345,661
Amortization of debt discount									$ 74,000
Estimated life of the warrant								5 years		5 years
Interest expense amortization period								5 years	5 years	5 years
Proceeds from financing obligations										$ 2,914,000	$ 50,830,000	$ 15,000,000
Common stock, shares issued									19,577,729	19,577,729	19,404,697
Product sales										$ 2,355,000	$ 2,564,000	$ 874,000
Subsequent Event [Member] | NASDAQ Capital Market [Member]
Subsequent Event [Line Items]
Minimum market value requirement		$ 35,000,000
Number of minimum consecutive business days of market capitalization for listed securities requirements		10 days
Number of days to evidence compliance with minimum bid price requirement		180 days
Minimum bid price requirement		$ 1.00
NASDAQ's listed securities requirement, description		On March 7, 2016, the Panel issued a determination granting our request for the continued listing of our common stock on The NASDAQ Capital Market. Our continued listing on The NASDAQ Capital Market is subject to, among other things, evidence of our compliance with the minimum $35,000,000 market value of listed securities requirement by June 14, 2016. In order to satisfy the market value of listed securities requirement, we must evidence a market capitalization of at least $35,000,000 for a minimum of 10 consecutive business days on or before June 14, 2016. We also remain subject to the 180-day period within which to evidence compliance with the minimum $1.00 bid price requirement, which does not expire until July 18, 2016.
Royalty Securitization Financing [Member]
Subsequent Event [Line Items]
Debt instrument, interest due			$ 2,756,000		$ 2,756,000
Renewal period										thirty day renewing periods through June 15, 2016
Debt instrument issued date										2014-03
Amortization of debt discount										$ 74,000
Ferrer Note [Member]
Subsequent Event [Line Items]
Proceeds from financing obligations				$ 3,000,000
Additional tranche to borrow													$ 1,000,000
Debt instrument interest rate				6.00%
Promissory note, due date				May 31, 2016
Common stock, shares issued				125,000
Ferrer Note [Member] | Maximum [Member]
Subsequent Event [Line Items]
Principal amount of promissory note													5,000,000
Ferrer Note [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from financing obligations	$ 1,000,000					$ 1,000,000
Principal amount of the Ferrer Note outstanding						$ 4,000,000
Ferrer Note [Member] | Promissory Note [Member]
Subsequent Event [Line Items]
Debt instrument interest rate				600.00%
Ferrer Note [Member] | Promissory Note [Member] | Maximum [Member]
Subsequent Event [Line Items]
Principal amount of promissory note													$ 5,000,000
Teva Note [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock shares issued upon debt conversion							2,172,886
Reduction in outstanding balance of Notes							$ 5,000,000
Outstanding balance of notes							$ 20,000,000
Frequency of periodic payment							Four
Annual consecutive payments amount							$ 5,000,000
Product sales							$ 50,000,000