Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 120,495	$ 226,748
Marketable securities	537,619	685,475
Accounts receivable	8,854	36,456
Prepaid expenses and other current assets	43,934	49,651
Total current assets	710,902	998,330
Marketable securities - noncurrent	286,567	99,864
Property and equipment, net	28,763	32,760
Operating lease right-of-use assets	100,331	115,375
Equity method investment	0	11,765
Investments and other assets	46,788	42,883
Total assets	1,173,351	1,300,977
Current liabilities:
Accounts payable	13,145	7,452
Accrued expenses	51,206	67,017
Current portion of operating lease liability	19,177	18,599
Current portion of deferred revenue	22,155	22,140
Total current liabilities	105,683	115,208
Deferred revenue, net of current portion	22,607	38,853
Long-term operating lease liability	82,446	96,747
Total liabilities	210,736	250,808
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock, $0.0001 par value; 240,000,000 shares authorized at September 30, 2024 and December 31, 2023; 101,796,365 and 92,997,158 shares issued and outstanding at September 30, 2024 and December 31, 2023, respectively	10	9
Additional paid-in capital	3,007,810	2,710,797
Accumulated other comprehensive income (loss)	3,297	(2,258)
Accumulated deficit	(2,048,502)	(1,658,379)
Total stockholders’ equity	962,615	1,050,169
Total liabilities and stockholders' equity	$ 1,173,351	$ 1,300,977