Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 53,225,799	$ 40,485,466
Short-term investment securities	14,009,644	0
Interest receivable	53,821	27,169
Prepaid research and development	9,117,863	1,742,824
Other current assets	258,721	47,804
Total current assets	76,665,848	42,303,263
Long-term investment securities	0	4,918,897
Equipment, net	7,763	5,718
Goodwill	799,391	799,391
Other assets	71,251	85,121
Total assets	77,544,253	48,112,390
Current liabilities:
Notes payable, current portion	183,144	677,778
Accounts payable and accrued expenses	7,967,548	4,764,502
Accrued compensation	599,083	532,500
Current portion of deferred revenue	152,381	152,381
Interest payable	0	190,017
Total current liabilities	8,902,156	6,317,178
Deferred revenue, net of current portion	1,561,905	1,676,191
Notes payable, less current portion, at fair value	0	64,529
Total liabilities	10,464,061	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 September 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, 41,481,047 and 34,336,235 shares issued, 41,439,738 and 34,294,926 shares outstanding at September 30, 2014 and December 31, 2013, respectively)	41,481	34,336
Contingently issuable shares	6	6
Additional paid-in capital	143,661,893	79,658,490
Treasury stock, at cost, 41,309 shares at September 30, 2014 and December 31, 2013	(234,337)	(234,337)
Accumulated deficit	(76,388,851)	(39,404,003)
Total equity	67,080,192	40,054,492
Total liabilities and equity	$ 77,544,253	$ 48,112,390