Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 70,992	$ 162,700
Marketable securities	682,192	1,109,794
Prepaid expenses and other current assets	31,825	50,826
Collaboration receivable - related party	$ 83,009	$ 13,660
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party, Type [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
Restricted cash	$ 1,332	$ 0
Total current assets	869,350	1,336,980
Property and equipment, net	1,921	2,898
Restricted cash	0	1,269
Right-of-use operating asset	4,458	10,532
Other long-term assets	6,548	4,770
Total assets	882,277	1,356,449
Current liabilities:
Accounts payable	10,318	18,950
Accrued expenses	67,264	72,666
Operating lease liability, current portion	5,165	7,643
Total current liabilities	82,747	99,259
Operating lease liability, net of current portion	0	4,491
Other liabilities	0	100
Total liabilities	82,747	103,850
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized at December 31, 2023 and December 31, 2022; no shares issued or outstanding at December 31, 2023 and December 31, 2022
Common stock, $0.0001 par value per share; 120,000,000 shares authorized at December 31, 2023 and December 31, 2022; 60,046,676 and 59,512,158 shares issued at December 31, 2023 and December 31, 2022; 60,043,643 and 59,509,125 shares outstanding at December 31, 2023 and December 31, 2022	6	6
Treasury stock, at cost, 3,033 shares at December 31, 2023 and December 31, 2022	(400)	(400)
Additional paid-in capital	3,370,397	3,291,369
Accumulated deficit	(2,569,659)	(2,028,170)
Accumulated other comprehensive loss	(814)	(10,206)
Total stockholders’ equity	799,530	1,252,599
Total liabilities and stockholders’ equity	$ 882,277	$ 1,356,449