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Balance Sheets (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 56,966,028 $ 2,310,603
Prepaid expenses and other current assets 719,019 2,573,072
Total current assets 57,685,047 4,883,675
Property and equipment, net 379,099 399,799
Total assets 58,064,146 5,283,474
Current liabilities:    
Accounts payable 1,797,042 1,144,895
Accrued bonuses 177,500 344,467
Accrued expenses 559,955 685,746
Current portion of deferred rent 107,686 104,191
Total current liabilities 2,642,183 2,279,299
Deferred rent 67,785 96,756
Total liabilities 2,709,968 2,376,055
Stockholders' equity:    
Preferred Stock: $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding at March 31, 2014 and December 31, 2013.      
Common stock; $0.001 par value; 100,000,000 authorized, 18,781,952 issued and outstanding at March 31, 2014; 70,258,276 authorized; 1,426,593 shares issued and outstanding at December 31, 2013. 18,783 1,428
Additional paid-in capital 123,712,654 66,150,674
Deficit accumulated during the development stage (68,377,259) (63,275,409)
Total stockholders' equity 55,354,178 2,907,419
Total liabilities and stockholders' equity 58,064,146 5,283,474
Series A-1 Convertible Preferred Stock [Member]
    
Stockholders' equity:    
Preferred Stock: $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding at March 31, 2014 and December 31, 2013.   $ 30,726