Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 130,849	$ 226,748
Marketable securities	560,219	685,475
Accounts receivable	12,329	36,456
Prepaid expenses and other current assets	53,814	49,651
Total current assets	757,211	998,330
Marketable securities - noncurrent	248,805	99,864
Property and equipment, net	30,273	32,760
Operating lease right-of-use assets	105,412	115,375
Equity method investment	0	11,765
Investments and other assets	49,835	42,883
Total assets	1,191,536	1,300,977
Current liabilities:
Accounts payable	18,816	7,452
Accrued expenses	45,127	67,017
Current portion of operating lease liability	18,963	18,599
Current portion of deferred revenue	22,184	22,140
Total current liabilities	105,090	115,208
Deferred revenue, net of current portion	28,052	38,853
Long-term operating lease liability	87,332	96,747
Total liabilities	220,474	250,808
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock, $0.0001 par value; 240,000,000 shares authorized at June 30, 2024 and December 31, 2023; 98,289,150 and 92,997,158 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively	10	9
Additional paid-in capital	2,884,997	2,710,797
Accumulated other comprehensive loss	(1,155)	(2,258)
Accumulated deficit	(1,912,790)	(1,658,379)
Total stockholders’ equity	971,062	1,050,169
Total liabilities and stockholders' equity	$ 1,191,536	$ 1,300,977