COMMON STOCK (Additional Information) (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 03, 2009 Warrant [Member]	Dec. 15, 2009 Common Stock Offering Underwriters Over Allotment Option [Member]	Nov. 18, 2009 Ipo [Member]
Common stock, shares issued (in shares)	16,377,247	16,217,019	198,269	125,431	3,500,000
Sale of Stock, Price Per Share				$ 17	$ 17
Proceeds from issuance of common stock				$ 2,000,000	$ 59,500,000
Proceeds From Issuance Initial Public Offering Net Of Underwriting Discounts Offering Expenses Commisions				$ 57,900,000	$ 55,900,000
Percentage Of Reduction In Common Stock Issue			50.00%
Shares Issuable Upon Exercise Of Warrants	200,014