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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 41,772,995 $ 45,263,698
Prepaid and other current assets 256,394 770,030
Total current assets 42,029,389 46,033,728
Property and equipment, net accumulated depreciation of $1,022,438 and $1,019,409, respectively 27,631 28,794
Other assets 45,000 45,000
Total assets 42,102,020 46,107,522
Current liabilities:    
Accounts payable 772,993 1,027,021
Accrued expenses 727,049 256,754
Total current liabilities 1,500,042 1,283,775
Total liabilities 1,500,042 1,283,775
Commitments and contingencies (notes 7 and 9)      
Stockholders' equity:    
Preferred stock, par value $0.0001 per share, 10,000,000 shares authorized; zero issued and outstanding 0 0
Common stock, par value $0.0001 per share, 100,000,000 shares authorized; 12,760,177 and 12,668,393 issued and outstanding 1,276 1,267
Additional paid-in capital 93,732,259 92,686,881
Accumulated deficit (53,131,557) (47,864,401)
Total stockholders' equity 40,601,978 44,823,747
Total liabilities and stockholders' equity $ 42,102,020 $ 46,107,522