CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 9,935	$ 135,173
Marketable securities	174,147
Restricted cash	1,289	460
Prepaid expenses and other current assets	3,777	152
Total current assets	189,148	135,785
Property and equipment, net	12,031	11,407
Other assets	3,945	436
Total assets	205,124	147,628
Current liabilities:
Accounts payable	2,576	2,483
Accrued liabilities	2,582	2,411
Deferred rent, current portion		28
Term loan, current portion	1,250	387
Deferred revenue, current portion	6,199	4,989
Total current liabilities	12,607	10,298
Deferred rent, net of current portion	434	242
Term loan, net of current portion	3,750	73
Deferred revenue, net of current portion	17,684	21,736
Total liabilities	34,475	32,349
Commitments and contingencies (Note 7)
Redeemable preferred stock:
Total redeemable preferred stock		162,223
Stockholders’ equity (deficit):
Preferred stock; par value of $0.001 per share, 10,000,000 and 0 shares authorized at September 30, 2019 and December 31, 2018. No shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively
Common stock, par value of $0.001 per share; 100,000,000 and 158,745,671 shares authorized at September 30, 2019 and December 31, 2018, respectively, 22,739,345 and 1,374,812 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	23	1
Additional paid-in capital	240,791	352
Accumulated other comprehensive loss	(58)
Accumulated deficit	(70,107)	(47,297)
Total stockholders’ equity (deficit)	170,649	(46,944)
Total liabilities, preferred stock and stockholders’ equity (deficit)	$ 205,124	147,628
Series A Preferred Stock
Redeemable preferred stock:
Total redeemable preferred stock		71,000
Series B Preferred Stock
Redeemable preferred stock:
Total redeemable preferred stock		$ 91,223