NOTES PAYABLE (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended							3 Months Ended
	Oct. 31, 2010	Sep. 30, 2009	Jun. 30, 2009	Feb. 28, 2009	Dec. 31, 2008	Sep. 30, 2008	Apr. 30, 2008 years	Dec. 31, 2010	Dec. 31, 2009	Apr. 03, 2008
Deerfield Financing
Funding agreements with Deerfield and affiliates
Funding Amount										$ 30
Funding and Royalty Agreement
Funding agreements with Deerfield and affiliates
Funding Amount										20
Proceeds from loans		3.3	3.3	3.3	3.3	3.3	3.3
Funding agreement term (in years)							10
Cash paid on exercise of option	27.1
Amount of royalty adjustment	1.3
Loss on the early extinguishment of debt								6
Minimum repayment amount of debt							17
Interest expense recognition period (in years)							3
Imputed interest rate (as a percent)					33.00%				31.00%	32.00%
Option and Put Agreement
Funding agreements with Deerfield and affiliates
Estimated option purchase price before April 3, 2011							23
Estimated option purchase price after April 3, 2011							26
Minimum estimated purchase price under put right after April 3, 2011							17
Maximum estimated purchase price under put right before April 3, 2011							23
Maximum estimated purchase price under put right after April 3, 2011							26
Cash paid for option exercise							2
Base option price	25
Option premium adjustment	2
Net amount of the base option price	23
Amount of cash adjustment	2.8
Securities purchase agreement
Funding agreements with Deerfield and affiliates
Funding Amount										$ 10