INTANGIBLE ASSETS AND GOODWILL (Details) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended			12 Months Ended		12 Months Ended
	Jun. 30, 2013	May 31, 2012	Jun. 30, 2013	May 31, 2012	Dec. 31, 2012		Jun. 30, 2013 IP license for PROCYSBI/RP103 [Member]	Jun. 30, 2013 Out license [Member]	Dec. 31, 2009 Out license [Member] 2009 Merger [Member]	Aug. 31, 2012 Tezampanel/ NGX426 [Member] 2009 Merger [Member]	Dec. 31, 2009 Tezampanel/ NGX426 [Member] 2009 Merger [Member]	Aug. 31, 2011 NeuroTrans? collaboration agreement [Member]
Summary of intangible assets [Abstract]
Total intangible assets									$ 1,100,000
Estimated useful life							20 years	16 years
Intangible assets acquired in the merger											900,000
Intangible asset, fair value										0
Impairment of assets charged to research and development expense										900,000		100,000
Amortization charged to research and development expense	50,000	37,000	86,000	73,000
Goodwill	$ 3,275,000		$ 3,275,000		$ 3,275,000	[1]

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2012.