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Balance Sheets (USD $)
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 66,217,242 $ 2,310,603
Prepaid expenses and other current assets 881,714 2,573,072
Total current assets 67,098,956 4,883,675
Property and equipment, net 420,640 399,799
Total assets 67,519,596 5,283,474
Current liabilities:    
Accounts payable 472,161 1,144,895
Accrued bonuses 372,756 344,467
Accrued expenses 2,640,591 685,746
Current portion of deferred rent 111,397 104,191
Total current liabilities 3,596,905 2,279,299
Deferred rent 38,837 96,756
Total liabilities 3,635,742 2,376,055
Stockholders' equity:    
Preferred Stock, value 0 0
Common stock; $0.001 par value; 100,000,000 authorized, 18,893,464 issued and outstanding at June 30, 2014; 70,258,276 authorized; 1,426,593 shares issued and outstanding at December 31, 2013 18,894 1,428
Additional paid-in capital 124,250,499 66,150,674
Accumulated deficit (60,385,539) (63,275,409)
Total stockholders' equity 63,883,854 2,907,419
Total liabilities and stockholders' equity 67,519,596 5,283,474
Series A-1 Convertible Preferred Stock [Member]
   
Stockholders' equity:    
Preferred Stock, value $ 0 $ 30,726