CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 38,262	$ 37,494
Short-term investments	237,351	314,649
Prepaid expenses and other current assets	5,575	8,545
Total current assets	281,188	360,688
Restricted cash	2,743	2,743
Property and equipment, net	77,687	61,908
Operating lease right-of-use assets	40,519	45,749
Other long-term assets	3,727	1,850
Total assets	405,864	472,938
Current liabilities
Accounts payable	4,284	1,761
Operating lease liabilities, current portion	6,057	4,249
Accrued and other current liabilities	15,299	16,036
Total current liabilities	25,640	22,046
Operating lease liabilities, net of current portion	83,408	78,685
Total liabilities	109,048	100,731
Commitments and contingencies (Note 7)
Stockholders’ equity
Common stock	5	5
Additional paid-in capital	704,900	690,814
Accumulated other comprehensive loss	(409)	(679)
Accumulated deficit	(407,680)	(317,933)
Total stockholders’ equity	296,816	372,207
Total liabilities and stockholders’ equity	$ 405,864	$ 472,938