Condensed Consolidated Statement Of Stockholders' Equity (USD $)	Common Stock [Member]	Additional Paid-In capital [Member]	Deficit Accumulated During The Development Stage [Member]	Total
Balance at Dec. 31, 2011	$ 6,203	$ 216,984,108	$ (183,325,501)	$ 33,664,810
Balance, shares at Dec. 31, 2011	62,034,146
Stock-based compensation		828,084		828,084
Sale and issuance of common stock in January 2012 at approximately $4.44 per share, net of issuance costs	499	22,144,721		22,145,220
Sale and issuance of common stock in January 2012 at approximately $4.44 per share, net of issuance costs, shares	4,989,275
Common stock issued in 2012 at par, pursuant to net-share (cashless) exercises of common stock warrants	2	(2)
Common stock issued in 2012 at par, pursuant to net-share (cashless) exercises of common stock warrants, shares	17,148
Net loss			(15,559,218)	(15,559,218)
Balance at Mar. 31, 2012	$ 6,704	$ 239,956,911	$ (198,884,719)	$ 41,078,896
Balance, shares at Mar. 31, 2012	67,040,569