Consolidated Balance Sheets - USD ($)	Dec. 31, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 47,748,000	$ 29,294,000
Marketable securities	15,754,000	3,768,000
Restricted cash		80,000
Accounts receivable - grant	1,215,000	1,697,000
Deferred offering costs		2,535,000
Prepaid expenses and other current assets	1,707,000	912,000
Total current assets	66,424,000	38,286,000
Property and equipment, net	599,000	348,000
Other non-current assets	40,000	20,000
TOTAL ASSETS	67,063,000	38,654,000
CURRENT LIABILITIES
Accounts payable	168,000	176,000
Deferred revenue	71,000	0
Accrued and other current liabilities	3,726,000	2,347,000
Total current liabilities	3,965,000	2,523,000
Other non-current liabilities	132,000	27,000
TOTAL LIABILITIES	4,097,000	2,550,000
Commitments and Contingencies (Note 14 and 16)
STOCKHOLDERS’ EQUITY (DEFICIT)
Preferred stock, $0.0001 par value; 10,000,000 shares and no shares authorized as of December 31, 2016 and 2015, respectively; no shares issued and outstanding as of December 31, 2016 and 2015, respectively
Common stock, $0.0001 par value; 500,000,000 shares and 25,000,000 shares authorized as of December 31, 2016 and 2015, respectively; 13,430,833 shares and 757,336 shares issued and outstanding as of December 31, 2016 and 2015, respectively	1,000
Additional paid-in capital	108,246,000	1,373,000
Accumulated other comprehensive loss	(4,000)	(1,000)
Accumulated deficit	(45,277,000)	(23,579,000)
TOTAL STOCKHOLDERS’ EQUITY (DEFICIT)	62,966,000	(22,207,000)
TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK, AND STOCKHOLDERS’ EQUITY (DEFICIT)	$ 67,063,000	38,654,000
Series A Convertible Preferred Stock
CURRENT LIABILITIES
Convertible preferred stock		13,573,000
Series B Convertible Preferred Stock
CURRENT LIABILITIES
Convertible preferred stock		$ 44,738,000