Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 99,627	$ 70,992
Marketable securities	469,527	682,192
Prepaid expenses and other current assets	19,630	31,825
Collaboration receivable - related party	14,871	83,009
Restricted cash	$ 1,332	$ 1,332
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
Total current assets	$ 604,987	$ 869,350
Property and equipment, net	1,019	1,921
Right-of-use operating asset	11,251	4,458
Other long-term assets	5,175	6,548
Total assets	622,432	882,277
Current liabilities:
Accounts payable	7,126	10,318
Accrued expenses	53,197	67,264
Operating lease liability, current portion	83	5,165
Total current liabilities	60,406	82,747
Operating lease liability, net of current portion	10,191	0
Total liabilities	70,597	82,747
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized at September 30, 2024 and December 31, 2023; no shares issued or outstanding at September 30, 2024 and December 31, 2023
Common stock, $0.0001 par value per share; 120,000,000 shares authorized at September 30, 2024 and December 31, 2023; 61,176,296 and 60,046,676 shares issued at September 30, 2024 and December 31, 2023; 61,173,263 and 60,043,643 shares outstanding at September 30, 2024 and December 31, 2023	6	6
Treasury stock, at cost, 3,033 shares at September 30, 2024 and December 31, 2023	(400)	(400)
Additional paid-in capital	3,425,875	3,370,397
Accumulated deficit	(2,874,547)	(2,569,659)
Accumulated other comprehensive gain (loss)	901	(814)
Total stockholders’ equity	551,835	799,530
Total liabilities and stockholders’ equity	$ 622,432	$ 882,277