Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 218,044	$ 293,477
Short-term marketable securities	1,118,171	571,930
Cost sharing reimbursements due from related party	0	1,226
Prepaid expenses and other current assets	36,104	30,601
Total current assets	1,372,319	897,234
Long-term marketable securities	0	425,449
Property and equipment, net	44,087	38,865
Operating lease right-of-use assets	30,437	30,743
Other non-current assets	13,399	11,871
Total assets	1,460,242	1,404,162
Current liabilities:
Accounts payable	2,790	4,779
Cost sharing payments due to related party	4,388	0
Accrued expenses and other current liabilities	66,691	53,165
Related party contract liability, current	290,053	292,386
Contract liabilities, current	0	27,915
Total current liabilities	363,922	378,245
Related party contract liability, less current portion	479	1,295
Contract liabilities, less current portion	0	3,398
Operating lease liabilities, less current portion	53,032	58,554
Other non-current liabilities	379	379
Total liabilities	417,812	441,871
Commitments and contingencies (Note 8)
Stockholders’ equity:
Convertible preferred stock, $0.01 par value; 40,000,000 shares authorized as of December 31, 2022 and December 31, 2021; 0 shares issued and outstanding as of December 31, 2022 and December 31, 2021	0	0
Common stock, $0.01 par value; 400,000,000 shares authorized as of December 31, 2022 and December 31, 2021; 135,965,918 and 122,283,305 shares issued and outstanding as of December 31, 2022 and December 31, 2021, respectively	1,686	1,548
Additional paid-in capital	2,018,617	1,608,238
Accumulated other comprehensive loss	(6,886)	(2,499)
Accumulated deficit	(970,987)	(644,996)
Total stockholders’ equity	1,042,430	962,291
Total liabilities and stockholders’ equity	$ 1,460,242	$ 1,404,162