CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 52,386	$ 68,395
Marketable securities (Note 4)	315,188	338,771
Contract assets	4,122	2,537
Prepaid expenses and other current assets	13,706	9,713
Total current assets	385,402	419,416
Marketable securities, non-current (Note 4)	104,759	152,328
Property and equipment, net (Note 6)	27,494	13,334
Right-of-use assets, operating leases	55,687	8,909
Other non-current assets	2,802	3,017
Restricted cash	5,801	6,130
Total assets	581,945	603,134
Current liabilities:
Accounts payable	3,745	4,335
Accrued expenses (Note 8)	22,490	27,502
Deferred revenue	24,302	35,260
Operating lease liabilities	2,566	2,535
Finance lease liabilities	1,231	1,408
Other current liabilities	268	303
Total current liabilities	54,602	71,343
Non-current liabilities
Deferred revenue, net of current portion	20,421	28,000
Operating lease liabilities, net of current portion	70,502	12,146
Finance lease liabilities, net of current portion	762	1,246
Other non-current liabilities	230	248
Total liabilities	146,517	112,983
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized at June 30, 2023 and December 31, 2022, 55,390,259 and 55,039,380 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	6	6
Additional paid-in capital	902,574	878,884
Accumulated deficit	(463,517)	(383,790)
Accumulated other comprehensive loss	(3,635)	(4,949)
Total stockholders’ equity	435,428	490,151
Total liabilities and stockholders’ equity	$ 581,945	$ 603,134