CAPITAL STRUCTURE, COMMON STOCK (Details) (USD $)			0 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jul. 03, 2013 Shares Issued under ATM Sales Agreement [Member]	Jun. 30, 2013 Shares Issued under ATM Sales Agreement [Member]	Apr. 30, 2012 Shares Issued under ATM Sales Agreement [Member]
Class of Stock [Line Items]
Common stock issued (in shares)	58,314,471	52,424,649		6,208,986
Common stock outstanding (in shares)	58,314,471	52,424,649
Maximum amount of common stock under ATM sales agreement			$ 100,000,000		$ 40,000,000
Sales commission percentage for sales made under ATM (in hundredths)				3.00%
Receivable from sale of common stock under ATM				5,300,000
Total amount of common stock sold pursuant to original Sales Agreement			38,300,000
Weighted-average selling price of shares sold under the ATM offering (in dollars per share)				$ 5.98
Cumulative net proceeds from sale of shares				$ 36,000,000