CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,152,129	$ 22,416,040
Marketable securities	18,776,390	38,658,933
Accounts receivable	35,134	12,181
Inventory	533,996	454,132
Prepaid expenses and other current assets	1,056,179	925,983
Total current assets	40,553,828	62,467,269
Property and equipment, net	400,991	556,315
Other assets	0	64,800
Restricted cash	253,190	126,595
Total assets	41,208,009	63,214,979
Current liabilities:
Accounts payable	919,030	1,192,183
Accrued expenses and other current liabilities	3,897,184	2,587,573
Deferred revenue	97,571	88,344
Deferred rent, current portion	58,821	21,095
Total current liabilities	4,972,606	3,889,195
Deferred rent, net of current portion	53,919	8,398
Total liabilities	5,026,525	3,897,593
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at September 30, 2017 and December 31, 2016; none issued or outstanding at September 30, 2017 and December 31, 2016	0	0
Common stock, $0.0001 par value; 100,000,000 shares authorized at September 30, 2017 and December 31, 2016; 17,971,816 and 17,970,590 shares issued at September 30, 2017 and December 31, 2016, and 17,541,377 and 16,773,798 shares outstanding at September 30, 2017 and December 31, 2016, respectively	1,754	1,678
Additional paid-in capital	139,231,785	135,962,935
Accumulated other comprehensive loss	(1,311)	(1,614)
Accumulated deficit	(103,050,744)	(76,645,613)
Total stockholders' equity	36,181,484	59,317,386
Total liabilities and stockholders' equity	$ 41,208,009	$ 63,214,979