Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 91,842,167	$ 25,031,280
Short-term investment securities	0	19,853,860
Interest receivable	0	83,852
Prepaid research and development	5,022,846	5,678,755
Other current assets	796,283	216,397
Total current assets	97,661,296	50,864,144
Restricted cash	586,259	583,208
Leasehold interest, net	2,466,202	2,042,281
Equipment, net	268,366	328,148
Goodwill	799,391	799,391
Other assets	0	164,375
Total assets	101,781,514	54,781,547
Current liabilities:
Accounts payable and accrued expenses	18,179,772	15,267,668
Accrued compensation	1,275,305	1,389,516
Current portion of deferred revenue	152,381	152,381
Notes payable	182,156	68,875
Total current liabilities	19,789,614	16,878,440
Deferred rent	1,341,372	816,257
Deferred revenue, net of current portion	1,104,762	1,219,048
Total liabilities	22,235,748	18,913,745
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, 2017 and December 31, 2016)	0	0
Common stock, $0.001 par value per share (150,000,000 shares authorized, 70,693,576 and 56,820,422 shares issued; 70,652,267 and 56,779,113 shares outstanding at September 30, 2017 and December 31, 2016, respectively)	70,694	56,820
Additional paid-in capital	403,712,474	272,432,139
Treasury stock, at cost, 41,309 shares at September 30, 2017 and December 31, 2016	(234,337)	(234,337)
Accumulated deficit	(324,003,065)	(236,386,820)
Total stockholders’ equity	79,545,766	35,867,802
Total liabilities and stockholders’ equity	$ 101,781,514	$ 54,781,547