Consolidated Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 12,817,000	$ 47,748,000
Marketable securities	37,482,000	15,754,000
Accounts receivable - grant	3,078,000	1,215,000
Prepaid expenses and other current assets	1,614,000	1,707,000
Total current assets	54,991,000	66,424,000
Property and equipment, net	854,000	599,000
Other non-current assets	232,000	40,000
TOTAL ASSETS	56,077,000	67,063,000
CURRENT LIABILITIES
Accounts payable	389,000	168,000
Deferred revenue	20,000	71,000
Accrued and other current liabilities	5,220,000	3,726,000
Total current liabilities	5,629,000	3,965,000
Other non-current liabilities	111,000	132,000
TOTAL LIABILITIES	5,740,000	4,097,000
Commitments and Contingencies (Note 14 and 16)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of December 31, 2017 and 2016; no shares issued and outstanding as of December 31, 2017 and 2016
Common stock, $0.0001 par value; 500,000,000 shares authorized as of December 31, 2017 and 2016, 16,670,188 shares and 13,430,833 shares issued and outstanding as of December 31, 2017 and 2016, respectively	2,000	1,000
Additional paid-in capital	122,950,000	108,246,000
Accumulated other comprehensive loss	(102,000)	(4,000)
Accumulated deficit	(72,513,000)	(45,277,000)
TOTAL STOCKHOLDERS’ EQUITY	50,337,000	62,966,000
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 56,077,000	$ 67,063,000