CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 22,569,107	$ 67,493,047
Short-term investments	24,376,904	0
Accounts receivable	85,152	98,736
Prepaid expenses and other assets	946,388	789,285
Total current assets	47,977,551	68,381,068
Property and equipment, net	4,654,876	2,690,579
Other assets	371,243	374,004
Total Assets	53,003,670	71,445,651
Current liabilities:
Accounts payable	925,173	1,040,868
Accrued expenses	4,558,809	1,903,797
Deferred rent	279,710	30,614
Current portion of long-term debt	801,024	5,225,818
Total current liabilities	6,564,716	8,201,097
Long-term debt, less current portion	15,595,400	11,246,188
Derivative financial instruments - warrants	2,622,243	3,297,077
Deferred rent, net of current portion	1,446,912	0
Total Liabilities	26,229,271	22,744,362
Commitments and contingencies (Note 9)
Stockholders’ equity
Preferred stock, $0.001 par value, 20,000,000 shares authorized; 60,600 shares outstanding at September 30, 2016 and December 31, 2015; designated as Series A Convertible Preferred Stock with liquidation preference of $606,000 at September 30, 2016 and December 31, 2015	60	60
Common stock, $0.0001 par value, 150,000,000 shares authorized; 30,599,140 and 29,737,601 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	3,060	2,974
Additional paid-in capital	166,337,512	157,585,498
Accumulated other comprehensive loss	(4,742)	0
Accumulated deficit	(139,561,491)	(108,887,243)
Total stockholders’ equity	26,774,399	48,701,289
Total liabilities and stockholders’ equity	$ 53,003,670	$ 71,445,651