Quarterly report pursuant to Section 13 or 15(d)

Balance Sheets

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Balance Sheets - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 23,641,952 $ 25,722,453
Marketable securities 11,621,731 1,670,606
Prepaid expenses and other current assets 1,055,410 368,787
Total current assets 36,319,093 27,761,846
Property and equipment, net 1,879,483 2,148,155
Other assets 143,621 143,621
Total assets 38,342,197 30,053,622
Current liabilities:    
Accounts payable 1,338,034 481,626
Accrued liabilities 2,360,201 2,711,207
Deferred rent 995,930 966,278
Total current liabilities 4,694,165 4,159,111
Warrant liabilities 521,400 313,004
Total liabilities $ 5,215,565 $ 4,472,115
Commitments and contingencies    
Stockholders' equity:    
Preferred stock, $0.0001 par value, 25,000,000 shares authorized and none outstanding at June 30, 2015 and December 31, 2014    
Common stock, $0.0001 par value, 100,000,000 shares authorized; 25,079,729 and 20,217,263 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively $ 2,508 $ 2,021
Additional paid-in capital 137,626,922 118,038,560
Accumulated other comprehensive loss (76,248) (627)
Accumulated deficit (104,426,550) (92,458,447)
Total stockholders' equity 33,126,632 25,581,507
Total liabilities and stockholders' equity $ 38,342,197 $ 30,053,622