BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 24,707	$ 25,291
Marketable securities	177,217	207,644
Prepaid expenses and other current assets	3,442	2,654
Total current assets	205,366	235,589
Restricted cash	4,044	4,044
Property and equipment, net	7,294	7,325
Right-of-use asset	30,107	30,412
Other assets	295	295
Total assets	247,106	277,665
Current liabilities:
Accounts payable	5,308	4,580
Accrued expenses and other current liabilities	10,147	15,768
Operating lease liability	2,188	1,481
Total current liabilities	17,643	21,829
Other liabilities	3,277	3,339
Operating lease liability	15,452	15,407
Total liabilities	36,372	40,575
Commitments (Note 8)
Stockholders’ equity:
Additional paid-in capital	698,785	693,252
Accumulated other comprehensive (loss) income	(235)	223
Accumulated deficit	(487,821)	(456,390)
Total stockholders’ equity	210,734	237,090
Total liabilities and stockholders’ equity	247,106	277,665
Voting Common Stock
Stockholders’ equity:
Common stock	4	4
Non-voting Common Stock
Stockholders’ equity:
Common stock	$ 1	$ 1