CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 50,152	$ 68,395
Marketable securities (Note 4)	346,725	338,771
Contract assets	3,320	2,537
Prepaid expenses and other current assets	11,353	9,713
Total current assets	411,550	419,416
Marketable securities, non-current (Note 4)	119,017	152,328
Property and equipment, net (Note 6)	17,432	13,334
Right-of-use assets, operating leases	56,604	8,909
Other non-current assets	3,155	3,017
Restricted cash	6,147	6,130
Total assets	613,905	603,134
Current liabilities:
Accounts payable	6,483	4,335
Accrued expenses (Note 8)	18,502	27,502
Deferred revenue	32,248	35,260
Operating lease liabilities	2,554	2,535
Finance lease liabilities	1,339	1,408
Other current liabilities	807	303
Total current liabilities	61,933	71,343
Non-current liabilities
Deferred revenue, net of current portion	24,866	28,000
Operating lease liabilities, net of current portion	63,875	12,146
Finance lease liabilities, net of current portion	989	1,246
Other non-current liabilities	237	248
Total liabilities	151,900	112,983
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized at March 31, 2023 and December 31, 2022, 55,276,226 and 55,039,380 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	6	6
Additional paid-in capital	889,755	878,884
Accumulated deficit	(424,718)	(383,790)
Accumulated other comprehensive loss	(3,038)	(4,949)
Total stockholders’ equity	462,005	490,151
Total liabilities and stockholders’ equity	$ 613,905	$ 603,134