SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Laboratory equipment	Dec. 31, 2012 Office furniture and equipment	Dec. 31, 2012 Computer equipment	Dec. 31, 2012 Manufacturing equipment Minimum	Dec. 31, 2012 Manufacturing equipment Maximum
Property and equipment
Estimated useful lives				5 years	5 years	3 years	7 years	10 years
Other Income
Other income related to milestone payment received	$ 3.0
Other income related to IRS Qualifying Therapeutic Discovery Grants	1.7
Foreign Currency Translation
Net unrealized gain related to foreign currency translation included in accumulated other comprehensive income		$ 2.6	$ 2.6