STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
STATEMENTS OF CASH FLOWS [Abstract]
Net proceeds from sales of common stock, offering costs	$ 6,100,000	$ 400,000	$ 200,000