CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 89,966	$ 120,256
Marketable securities (Note 4)	373,184	368,488
Contract assets	20,000	947
Prepaid expenses and other current assets	17,801	20,577
Total current assets	500,951	510,268
Marketable securities, non-current (Note 4)	312,335	362,159
Property and equipment, net (Note 6)	49,172	50,457
Right-of-use assets, operating leases	46,734	47,407
Other non-current assets	3,313	1,950
Restricted cash	5,807	5,794
Total assets	918,312	978,035
Current liabilities:
Accounts payable	10,263	5,989
Accrued expenses (Note 8)	23,117	34,867
Deferred revenue	11,476	13,576
Operating lease liabilities	11,681	11,594
Finance lease liabilities	1,559	1,518
Other current liabilities	893	223
Total current liabilities	58,989	67,767
Non-current liabilities
Operating lease liabilities, net of current portion	71,182	72,423
Finance lease liabilities, net of current portion	1,908	2,226
Total liabilities	132,079	142,416
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized at at March 31, 2025 and December 31, 2024, 65,112,714 and 64,890,193 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	7	7
Additional paid-in capital	1,606,475	1,591,707
Accumulated deficit	(820,191)	(754,610)
Accumulated other comprehensive loss	(58)	(1,485)
Total stockholders’ equity	786,233	835,619
Total liabilities and stockholders’ equity	$ 918,312	$ 978,035