CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $)	Total	Common stock [Member]	Additional paid-in capital [Member]	Deficit accumulated during the development stage [Member]
Balance at Dec. 31, 2013	$ 43,255,672	$ 7,843	$ 274,725,472	$ (231,477,643)
Balance (in shares) at Dec. 31, 2013		78,433,916
Stock-based compensation	706,060	0	706,060	0
Stock options exercised	594	3	591	0
Stock options exercised (in shares)		23,210
Net loss	(8,073,660)	0	0	(8,073,660)
Balance at Mar. 31, 2014	$ 35,888,666	$ 7,846	$ 275,432,123	$ (239,551,303)
Balance (in shares) at Mar. 31, 2014		78,457,126