Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 15,707,956	$ 13,000,372
Prepaid expenses	0	160,320
Total current assets	15,707,956	13,160,692
Property and equipment, net of accumulated depreciation of $2,750,788 and $2,531,917, at March 31, 2013 and December 31, 2012, respectively	3,681,847	1,536,658
Restricted cash	17,439	17,439
Total assets	19,407,242	14,714,789
Current liabilities
Accounts payable	419,518	348,683
Bonus accrual	273,675	0
Total current liabilities	693,193	348,683
Total liabilities	693,193	348,683
Commitments and contingencies (Note 3)	0	0
Shareholders’ equity
Common stock, $0.001 par value; 100,000,000 shares authorized, 10,385,386 shares issued and outstanding at March 31, 2013 and 9,854,268 shares issued and outstanding at December 31, 2012	10,385	9,854
Additional paid-in capital	89,069,799	85,669,802
Accumulated deficit	(70,366,135)	(71,313,550)
Total shareholders’ equity	18,714,049	14,366,106
Total liabilities and shareholders’ equity	$ 19,407,242	$ 14,714,789