Liquidity and Management's Plans - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Jul. 05, 2013 Subsequent Event [Member]	Nov. 30, 2012 Series A Non-Voting Convertible Preferred Stock [Member]
Liquidity and Management's Plans [Line Items]
Net royalties under the medga agreements	$ 855,101		$ 855,101
Upfront and milestone payments from Endo license agreement					45,000,000
Preferred Stock, par value	$ 0.001		$ 0.001		$ 0.001			$ 0.001
Net proceeds from registered direct offering of Common Stock and newly designated Series					38,400,000
Exercise of Common Stock options			9,235	410,402	2,100,000
Exercise of Common Stock warrants					900,000
Secured loan facility							20,000,000
Net proceeds in the aggregate amount							19,900,000
Cash and cash equivalents	37,430,878	43,030,542	37,430,878	43,030,542	63,189,307	10,750,205
Cash from operations			(25,766,016)	32,952,532
Stockholders' equity	$ 27,086,192		$ 27,086,192		$ 49,777,213