Subsequent Events (Details) $ in Thousands		2 Months Ended	12 Months Ended		20 Months Ended	26 Months Ended
	Feb. 05, 2016 patent	Mar. 07, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) shares
Subsequent events
Remaining outstanding balance			$ 7,189	$ 26,947	$ 26,947	$ 7,189
7.50% Convertible Senior Secured Notes due 2019
Subsequent events
Principal amount of the Notes converted			$ 27,522	$ 13,400	53,941	$ 81,500
Shares of common stock issued in conversion of Notes and accrued interest thereon | shares			5,200,000	2,500,000		15,372,477
Remaining outstanding balance			$ 7,189	$ 26,947	$ 26,947	$ 7,189
Subsequent Events | Oxtellar XR Litigation
Subsequent events
Number of patents found infringed upon | patent	2
Number of patents allegedly infringed upon | patent	3
Subsequent Events | 7.50% Convertible Senior Secured Notes due 2019
Subsequent events
Principal amount of the Notes converted		$ 2,000
Shares of common stock issued in conversion of Notes and accrued interest thereon | shares		400,000
Remaining outstanding balance		$ 6,600