CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 22,416,040	$ 66,686,695
Marketable securities	38,658,933	24,652,348
Accounts receivable	12,181	0
Inventory	454,132	0
Prepaid expenses and other current assets	925,983	908,574
Total current assets	62,467,269	92,247,617
Marketable securities	0	2,312,949
Property and equipment, net	556,315	382,437
Other assets	64,800	0
Restricted cash	126,595	126,835
Total assets	63,214,979	95,069,838
Current liabilities:
Accounts payable	1,192,183	875,646
Accrued expenses and other current liabilities	2,587,573	1,947,374
Deferred revenue	88,344	0
Deferred rent, current portion	21,095	24,381
Total current liabilities	3,889,195	2,847,401
Deferred rent, net of current portion	8,398	14,587
Other long term liabilities	0	15,442
Total liabilities	3,897,593	2,877,430
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized at December 31, 2016 and December 31, 2015; none issued or outstanding at December 31, 2016 and December 31, 2015	0	0
Common stock, $0.0001 par value; 100,000,000 shares authorized at December 31, 2016 and December 31, 2015, 17,970,590 and 17,943,880 shares issued at December 31, 2016 and December 31, 2015, respectively, and 16,773,798 and 15,741,618 shares outstanding at December 31, 2016 and December 31, 2015, respectively	1,678	1,574
Additional paid-in capital	135,962,935	129,367,978
Accumulated other comprehensive loss	(1,614)	(24,654)
Accumulated deficit	(76,645,613)	(37,152,490)
Total stockholders' equity	59,317,386	92,192,408
Total liabilities and stockholders' equity	$ 63,214,979	$ 95,069,838