STOCK-BASED COMPENSATION, Employee Stock Purchase Plan (Details) (USD $)	3 Months Ended					12 Months Ended
	Mar. 31, 2012 General and Administrative Expense [Member]	Mar. 31, 2011 General and Administrative Expense [Member]	Mar. 31, 2012 Research and Development Expense [Member]	Mar. 31, 2011 Research and Development Expense [Member]	Mar. 31, 2012 Employee Stock Purchase Plan (ESPP) [Member]	Dec. 31, 2012 Employee Stock Purchase Plan (ESPP) [Member]	Jun. 25, 2009 Employee Stock Purchase Plan (ESPP) [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Reserved for issuance (in shares)							1,000,000
Percentage of market value (in hundredths)					85.00%
Maximum allocation of base compensation (in hundredths)						10.00%
Maximum shares per purchase date (in shares)					12,500
Maximum value per calendar year, per employee						$ 25,000
Common stock issued (in shares)					2,298
Proceeds from common stock issued					71,000
Charges to expense	$ 5,000	$ 6,000	$ 20,000	$ 14,000