CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 30,965,791	$ 41,513,060
Incentive and tax receivables	3,613,943	356,718
Prepaid expenses and other current assets	1,830,958	1,545,917
Total current assets	36,410,692	43,415,695
Property and equipment, net	143,382	227,646
Other assets	200	200
Total assets	36,554,274	43,643,541
Current liabilities:
Accounts payable	1,848,084	823,401
Accrued expenses	4,284,907	2,272,991
Deferred grant revenue	833,975	841,225
Total current liabilities	6,966,966	3,937,617
Commitments and contingencies (note 11)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value; 200,000,000 shares authorized; 9,994,825 shares issued and outstanding at December 31, 2016 and 9,199,919 shares issued and outstanding at December 31, 2015	9,995	9,200
Additional paid-in capital	75,545,875	62,276,779
Accumulated deficit	(45,968,562)	(22,580,055)
Total stockholders' equity	29,587,308	39,705,924
Total liabilities and stockholders' equity	$ 36,554,274	$ 43,643,541