CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 250,285	$ 31,040
Short-term investments	187,109	217,149
Prepaid expenses and other current assets	5,387	4,882
Total current assets	442,781	253,071
Long-term investments	9,814
Restricted cash	2,743	2,743
Property and equipment, net	78,522	79,326
Operating lease right-of-use assets	39,357	39,949
Other long-term assets	3,719	3,796
Total assets	576,936	378,885
Current liabilities
Accounts payable	3,177	3,665
Operating lease liabilities, current portion	6,078	6,069
Accrued and other current liabilities	12,934	13,596
Total current liabilities	22,189	23,330
Operating lease liabilities, net of current portion	81,096	82,270
Total liabilities	103,285	105,600
Commitments and contingencies (Note 7)
Stockholders’ equity
Common stock	7	5
Additional paid-in capital	938,723	708,706
Accumulated other comprehensive (loss) income	(127)	8
Accumulated deficit	(464,952)	(435,434)
Total stockholders’ equity	473,651	273,285
Total liabilities and stockholders’ equity	$ 576,936	$ 378,885