Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 26,934,000	$ 47,748,000
Marketable securities	36,459,000	15,754,000
Accounts receivable - grant	1,213,000	1,215,000
Prepaid expenses and other current assets	1,597,000	1,707,000
Total current assets	66,203,000	66,424,000
Property and equipment, net	802,000	599,000
Other non-current assets	139,000	40,000
TOTAL ASSETS	67,144,000	67,063,000
CURRENT LIABILITIES
Accounts payable	634,000	168,000
Deferred revenue	71,000	71,000
Accrued and other current liabilities	3,713,000	3,726,000
Total current liabilities	4,418,000	3,965,000
Other non-current liabilities	122,000	132,000
TOTAL LIABILITIES	4,540,000	4,097,000
Commitments and Contingencies (Notes 9 and 11)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of June 30, 2017 and December 31, 2016; no shares issued and outstanding as of June 30, 2017 and December 31, 2016
Common stock, $0.0001 par value; 500,000,000 shares authorized as of June 30, 2017 and December 31, 2016; 16,452,260 shares and 13,430,833 shares issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	2,000	1,000
Additional paid-in capital	120,787,000	108,246,000
Accumulated other comprehensive loss	(29,000)	(4,000)
Accumulated deficit	(58,156,000)	(45,277,000)
TOTAL STOCKHOLDERS’ EQUITY	62,604,000	62,966,000
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 67,144,000	$ 67,063,000