Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 51,353,000	$ 53,349,000
Marketable securities	74,570,000	0
Prepaid expenses	2,398,000	792,000
Deferred offering costs		929,000
Other current assets	51,000	84,000
Total current assets	128,372,000	55,154,000
Restricted cash	84,000	0
Property and equipment, net	324,000	39,000
Total assets	128,780,000	55,193,000
Current liabilities:
Accounts payable (including related party amounts of $37 and $32 as of June 30, 2018 and December 31, 2017, respectively)	4,523,000	1,515,000
Accrued liabilities	6,568,000	3,987,000
Funding advance	500,000
Total current liabilities	11,591,000	5,502,000
Other liabilities	25,000
Total liabilities	11,616,000	5,502,000
Commitments and contingencies (see Note 10)
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value, 10,000,000 and no shares authorized as of June 30, 2018 and December 31, 2017, respectively; no shares issued and outstanding as of June 30, 2018 and December 31, 2017
Common stock, $0.0001 par value, 150,000,000 and 30,000,000 shares authorized as of June 30, 2018 and December 31, 2017, respectively; 28,048,315 and 5,659,089 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively; 28,046,315 and 4,562,640 shares vested as of June 30, 2018 and December 31, 2017, respectively	3,000	1,000
Additional paid-in capital	174,420,000	1,849,000
Accumulated deficit	(57,229,000)	(33,779,000)
Accumulated other comprehensive loss	(30,000)
Total stockholders’ equity (deficit)	117,164,000	(31,929,000)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	$ 128,780,000	55,193,000
Series A Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		41,674,000
Series B Redeemable Convertible Preferred Stock
Redeemable convertible preferred stock:
Redeemable convertible preferred stock		$ 39,946,000