CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 81,051	$ 68,395
Marketable securities (Note 4)	276,774	338,771
Contract assets	3,778	2,537
Prepaid expenses and other current assets	14,091	9,713
Total current assets	375,694	419,416
Marketable securities, non-current (Note 4)	76,988	152,328
Property and equipment, net (Note 6)	36,145	13,334
Right-of-use assets, operating leases	54,955	8,909
Other non-current assets	2,802	3,017
Restricted cash	5,794	6,130
Total assets	552,378	603,134
Current liabilities:
Accounts payable	4,978	4,335
Accrued expenses (Note 8)	26,383	27,502
Deferred revenue	27,352	35,260
Operating lease liabilities	2,585	2,535
Finance lease liabilities	1,010	1,408
Other current liabilities	858	303
Total current liabilities	63,166	71,343
Non-current liabilities
Deferred revenue, net of current portion	16,421	28,000
Operating lease liabilities, net of current portion	76,605	12,146
Finance lease liabilities, net of current portion	643	1,246
Other non-current liabilities	8	248
Total liabilities	156,843	112,983
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized at September 30, 2023 and December 31, 2022, 55,450,239 and 55,039,380 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	6	6
Additional paid-in capital	914,363	878,884
Accumulated deficit	(516,384)	(383,790)
Accumulated other comprehensive loss	(2,450)	(4,949)
Total stockholders’ equity	395,535	490,151
Total liabilities and stockholders’ equity	$ 552,378	$ 603,134