Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 156,172	$ 189,182
Marketable securities	303,479	412,333
Accounts receivable	11,353	8,517
Prepaid expenses and other current assets	24,941	29,831
Total current assets	495,945	639,863
Marketable securities - noncurrent	170,855	260,215
Property and equipment, net	22,806	27,381
Operating lease right-of-use assets	129,045	219,292
Investments and other assets	80,243	44,264
Total assets	898,894	1,191,015
Current liabilities:
Accounts payable	9,802	14,589
Accrued expenses	41,553	55,355
Current portion of operating lease liability	26,990	20,246
Current portion of deferred revenue	17,154	20,661
Total current liabilities	95,499	110,851
Deferred revenue, net of current portion	12,539	18,256
Long-term operating lease liability	75,601	189,952
Total liabilities	183,639	319,059
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock, $0.0001 par value; 240,000,000 shares authorized at June 30, 2025 and December 31, 2024; 105,330,693 and 102,029,594 shares issued and outstanding at June 30, 2025 and December 31, 2024, respectively	10	10
Additional paid-in capital	3,107,576	3,048,741
Accumulated other comprehensive income	653	605
Accumulated deficit	(2,392,984)	(2,177,400)
Total stockholders’ equity	715,255	871,956
Total liabilities and stockholders' equity	$ 898,894	$ 1,191,015