CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 67,612	$ 109,966
Marketable securities (Note 4)	442,341	264,915
Accounts receivable	0	15,000
Contract assets	1,704	3,762
Prepaid expenses and other current assets	13,750	11,674
Total current assets	525,407	405,317
Marketable securities, non-current (Note 4)	192,445	61,434
Property and equipment, net (Note 6)	51,735	48,134
Right-of-use assets, operating leases	48,704	52,945
Other non-current assets	1,889	2,118
Restricted cash	5,841	5,811
Total assets	826,021	575,759
Current liabilities:
Accounts payable	6,510	7,075
Accrued expenses (Note 8)	23,780	33,864
Deferred revenue	19,259	37,883
Operating lease liabilities	11,424	5,068
Finance lease liabilities	992	1,277
Other current liabilities	178	524
Total current liabilities	62,143	85,691
Non-current liabilities
Deferred revenue, net of current portion	3,189	16,768
Operating lease liabilities, net of current portion	74,822	77,028
Finance lease liabilities, net of current portion	943	1,301
Total liabilities	141,097	180,788
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized at June 30, 2024 and December 31, 2023, 61,572,383 and 55,390,259 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively	6	6
Additional paid-in capital	1,308,388	926,269
Accumulated deficit	(621,371)	(530,752)
Accumulated other comprehensive loss	(2,099)	(552)
Total stockholders’ equity	684,924	394,971
Total liabilities and stockholders’ equity	$ 826,021	$ 575,759