CAPITAL STRUCTURE, COMMON STOCK (Details) (USD $)	3 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Jul. 03, 2013 Shares Issued under ATM Sales Agreement [Member]	Sep. 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)	61,142,756	61,142,756	52,424,649		7,599,474
Common stock outstanding (in shares)	61,142,756	61,142,756	52,424,649
Exercises of stock options	$ 1,500,000	$ 1,516,000
Exercise of stock options (in shares)	370,352	378,366
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%
Total amount of common stock sold pursuant to original Sales Agreement				37,100,000
Weighted-average selling price of shares sold under the ATM offering (in dollars per share)					$ 7.08
Cumulative net proceeds from sale of shares					$ 52,100,000