CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY [Parenthetical] (USD $)	12 Months Ended
	Dec. 31, 2012 At The Market Equity Offering Program [Member]	Dec. 31, 2011 Exercise Of Common Stock Warrants [Member]	Dec. 31, 2010 Exercise Of Common Stock Warrants [Member]	Dec. 31, 2008 Exercise Of Common Stock Warrants [Member]	Dec. 31, 2011 Exercise Of Common Stock Warrants One [Member]	Dec. 31, 2012 January [Member]	Dec. 31, 2011 February [Member]	Dec. 31, 2006 February [Member]	Dec. 31, 2010 March [Member]	Dec. 31, 2007 March [Member]	Dec. 31, 2004 March [Member] License Fee [Member]	Dec. 31, 2008 April [Member]	Dec. 31, 2004 April [Member] Chief Executive [Member]	Dec. 31, 2007 April [Member] License Fee [Member]	Dec. 31, 2007 May [Member]	Dec. 31, 2006 May [Member]	Dec. 31, 2007 June [Member] Exercise Of Common Stock Warrants [Member]	Dec. 31, 2009 July [Member]	Dec. 31, 2010 September [Member]	Dec. 31, 2010 October [Member]	Dec. 31, 2007 October [Member] Exercise Of Common Stock Warrants [Member]	Dec. 31, 2012 November [Member]	Dec. 31, 2008 November [Member]	Dec. 31, 2007 November [Member]	Dec. 31, 2004 December [Member]
Fair value of warrants issued finders fee amount, per share															$ 1.75
Sale and issuance of common stock, per share	$ 3.02	$ 4.20	$ 4.20	$ 4.20	$ 2.88	$ 4.44	$ 3.75	$ 2.77	$ 2.50	$ 4.33	$ 0.0009	$ 4.90	$ 0.0009	$ 5.63		$ 4.35	$ 4.2	$ 3.73	$ 4.49	$ 4.60	$ 4.20	$ 2.79		$ 6.19	$ 2.45
Final adjustment to issuance costs accrued in conjunction with the sale and issuance, per share																							$ 6.19