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Condensed Consolidated Balance Sheets (USD $)
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 37,077,977 $ 40,485,466
Short-term investment securities 7,959,652 0
Interest receivable 74,682 27,169
Prepaid research and development 3,976,742 1,742,824
Other current assets 197,855 47,804
Total current assets 49,286,908 42,303,263
Long-term investment securities 6,110,309 4,918,897
Equipment, net 7,326 5,718
Goodwill 799,391 799,391
Other assets 98,365 85,121
Total assets 56,302,299 48,112,390
Current liabilities:    
Notes payable, current portion 159,214 677,778
Accounts payable and accrued expenses 1,899,389 4,764,502
Accrued compensation 395,500 532,500
Current portion of deferred revenue 152,381 152,381
Interest payable 0 190,017
Total current liabilities 2,606,484 6,317,178
Deferred revenue, net of current portion 1,600,000 1,676,191
Notes payable, less current portion, at fair value 0 64,529
Total liabilities 4,206,484 8,057,898
Commitments and contingencies      
Equity:    
Preferred stock, $0.001 par value per share (10,000,000 shares authorized, 0 issued and outstanding as of June 30, 2014 and December 31, 2013) 0 0
Common stock, $0.001 par value per share (150,000,000 and 500,000,000 shares authorized, 38,161,964 and 34,336,235 shares issued, 38,120,655 and 34,294,926 shares outstanding at June 30, 2014 and December 31, 2013, respectively) 38,162 34,336
Contingently issuable shares 6 6
Additional paid-in capital 111,229,666 79,658,490
Treasury stock, at cost, 41,309 shares at June 30, 2014 and December 31, 2013 (234,337) (234,337)
Accumulated deficit (58,937,682) (39,404,003)
Total equity 52,095,815 40,054,492
Total liabilities and equity $ 56,302,299 $ 48,112,390