Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 65,461,940	$ 55,713,784
Short-term investment securities	28,701,209	23,062,034
Interest receivable	158,527	85,516
Prepaid research and development	9,950,893	6,179,743
Other current assets	457,918	173,952
Total current assets	104,730,487	85,215,029
Restricted cash	578,126	575,012
Long-term investment securities	21,088,192	0
Property, plant and equipment, net	69,225	20,357
Goodwill	799,391	799,391
Other assets	141,717	137,101
Total assets	127,407,138	86,746,890
Current liabilities:
Accounts payable and accrued expenses	8,583,003	3,991,625
Accrued compensation	768,750	702,000
Current portion of deferred revenue	152,381	152,381
Notes payable	181,668	275,190
Total current liabilities	9,685,802	5,121,196
Deferred revenue, net of current portion	1,409,524	1,523,810
Total liabilities	$ 11,095,326	$ 6,645,006
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value per share (10,000,000 shares authorized, none issued and outstanding as of September 30, 2015 and December 31, 2014)	$ 0	$ 0
Common stock, $0.001 par value per share (150,000,000 shares authorized, 52,558,217 and 44,974,248 shares issued, 52,516,908 and 44,932,939 shares outstanding at September 30, 2015 and December 31, 2014, respectively)	52,558	44,974
Contingently issuable shares	6	6
Additional paid-in capital	257,015,699	175,476,521
Treasury stock, at cost	(234,337)	(234,337)
Accumulated deficit	(140,522,114)	(95,185,280)
Total stockholders’ equity	116,311,812	80,101,884
Total liabilities and stockholders’ equity	$ 127,407,138	$ 86,746,890