Subsequent Event (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2013	Jun. 30, 2013	Jun. 30, 2013	Aug. 07, 2013 Oxtellar XR [Member] Subsequent events item
Subsequent events
Number of patent infringements by generic drug makers				2
Aggregate principal amount of convertible senior secured notes issued	$ 90,000,000	$ 90,000,000
Fixed interest rate (as a percent)	7.50%	7.50%	7.50%
Net proceeds from issuance of debt		86,500,000	90,000,000
Loss on extinguishment of debt		$ (1,162,000)	$ (1,162,000)