CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 45,026	$ 57,706
Marketable securities	115,072	172,539
Prepaid expenses	3,673	4,368
Other current assets	667	2,337
Total current assets	164,438	236,950
Restricted cash equivalents	2,413	2,413
Property and equipment, net	10,824	12,634
Operating lease right-of-use assets	41,262	44,444
Other assets	4,086	2,925
Total assets	223,023	299,366
Current liabilities:
Accounts payable	1,309	1,772
Accrued liabilities	10,274	7,889
Operating lease liabilities	3,743	3,272
Other current liabilities	62	186
Total current liabilities	15,388	13,119
Long-term liabilities:
Operating lease liabilities—non-current	32,854	35,640
Total liabilities	48,242	48,759
Stockholders' equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of September 30, 2023 and December 31, 2022; 0 shares issued and outstanding as of September 30, 2023 and December 31, 2022
Common stock, $0.0001 par value; 400,000,000 shares authorized as of September 30, 2023 and December 31, 2022; 67,798,343 and 66,079,597 shares issued and 67,785,469 and 65,996,138 outstanding as of September 30, 2023 and December 31, 2022, respectively	7	7
Additional paid-in capital	488,873	473,587
Accumulated other comprehensive loss	(280)	(770)
Accumulated deficit	(313,819)	(222,217)
Total stockholders' equity	174,781	250,607
Total liabilities and stockholders' equity	$ 223,023	$ 299,366