Debt - Senior Secured Debt - Additional Information (Detail) - USD ($)					2 Months Ended	9 Months Ended	12 Months Ended
	May 03, 2016	Mar. 25, 2016	Jan. 29, 2016	May 18, 2015	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	May 23, 2013
Debt Instrument [Line Items]
Fair value of warrant, current						$ 335,000
Outstanding accrued interest and prepayment premium conversion, converted amount						17,934,000
Senior Secured Debt, net						52,159,000	$ 63,093,000
Payment in Kind (PIK) Note [Member]
Debt Instrument [Line Items]
Senior Secured Debt, net						2,379,000	10,956,000
Series AB Preferred Stock [Member] | Restructured Debt [Member]
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount						$ 2,100,000
Number of shares issued upon conversion of debt						1,660,530
Capital Royalty Partners Term Loan [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage								11.00%
Minimum revenue covenant							50,000,000
Aggregate interest rate				15.00%
Prepayment premium				4.00%
Gain (loss) associated forbearance agreements		$ 0				$ 0	$ 0
Forbearance agreement extension description						On March 25, 2016, the Company and CRG amended the forbearance agreement to extend the expiration of the forbearance period to April 30, 2016
Capital Royalty Partners Term Loan [Member] | Cash Interest [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage								7.50%
Capital Royalty Partners Term Loan [Member] | Payment in Kind (PIK) Note [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage								3.50%
Capital Royalty Partners Term Loan [Member] | Restructured Debt [Member]
Debt Instrument [Line Items]
Senior Secured Debt, net	$ 50,000,000
Capital Royalty Partners Term Loan [Member] | Restructured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage	11.00%
Outstanding accrued interest and prepayment premium conversion, converted amount					$ 16,500,000
Extended repayment debt, commence date						Jun. 30, 2018
Extended repayment debt, completion date						Mar. 31, 2021
Minimum cash balance covenant						$ 5,000,000
Required covenant						The restructured Term Loan agreement contains a financial covenant, which requires the Company to maintain a minimum cash balance of $5.0 million.
Cash and cash equivalents covenant held						$ 15,500,000
Capital Royalty Partners Term Loan [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Warrants to purchase shares			3,816,960
Capital Royalty Partners Term Loan [Member] | Common Stock [Member] | Restructured Debt [Member]
Debt Instrument [Line Items]
Number of shares converted	2,053,959
Capital Royalty Partners Term Loan [Member] | Common Stock [Member] | Restructured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Number of shares converted	4,649,859
Capital Royalty Partners Term Loan [Member] | Series AB Preferred Stock [Member]
Debt Instrument [Line Items]
Warrants to purchase shares			16,000,000
Warrant exercisable price			$ 1.25
Term of warrants			1 year
Fair value of warrant, current			$ 4,000,000
Capital Royalty Partners Term Loan [Member] | Series AB Preferred Stock [Member] | Restructured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Outstanding accrued interest and prepayment premium conversion, converted amount	$ 16,500,000
Number of shares issued upon conversion of debt	8,609,824				8,609,824
Capital Royalty Partners Term Loan [Member] | Series AB Preferred Stock [Member] | Common Stock [Member] | Restructured Debt [Member]
Debt Instrument [Line Items]
Number of shares converted					2,053,959
Capital Royalty Partners Term Loan [Member] | Series AB Preferred Stock [Member] | Common Stock [Member] | Restructured Debt [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Number of shares converted					4,649,859