CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit during Development Stage [Member]
Balance at Dec. 31, 2012	$ 25,916,150	$ 6,708	$ 240,970,852	$ (215,061,410)
Balance (in shares) at Dec. 31, 2012		67,075,779
Stock-based compensation	1,034,624	0	1,034,624	0
Common stock issued pursuant to exercise of stock options	76,362	4	76,358	0
Common stock issued pursuant to exercise of stock options (in shares)		44,375
Net loss	(7,253,103)	0	0	(7,253,103)
Balance at Jun. 30, 2013	$ 19,774,033	$ 6,712	$ 242,081,834	$ (222,314,513)
Balance (in shares) at Jun. 30, 2013		67,120,154