Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 172,653	$ 70,992
Marketable securities	544,360	682,192
Prepaid expenses and other current assets	26,588	31,825
Collaboration receivable - related party	10,509	83,009
Restricted cash	$ 1,332	$ 1,332
Accounts Receivable, after Allowance for Credit Loss, Current, Related Party, Type [Extensible Enumeration]	Related Party [Member]	Related Party [Member]
Total current assets	$ 755,442	$ 869,350
Property and equipment, net	1,585	1,921
Restricted cash	1,500	0
Right-of-use operating asset	2,857	4,458
Other long-term assets	6,216	6,548
Total assets	767,600	882,277
Current liabilities:
Accounts payable	6,479	10,318
Accrued expenses	52,014	67,264
Operating lease liability, current portion	3,306	5,165
Total current liabilities	61,799	82,747
Total liabilities	61,799	82,747
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized at March 31, 2024 and December 31, 2023; no shares issued or outstanding at March 31, 2024 and December 31, 2023
Common stock, $0.0001 par value per share; 120,000,000 shares authorized at March 31, 2014 and December 31, 2023; 60,185,064 and 60,046,676 shares issued at March 31, 2024 and December 31, 2023; 60,182,031 and 60,043,643 shares outstanding at March 31,2024 and December 31, 2023	6	6
Treasury stock, at cost, 3,033 shares at March 31, 2024 and December 31, 2023	(400)	(400)
Additional paid-in capital	3,385,124	3,370,397
Accumulated deficit	(2,678,142)	(2,569,659)
Accumulated other comprehensive loss	(787)	(814)
Total stockholders’ equity	705,801	799,530
Total liabilities and stockholders’ equity	$ 767,600	$ 882,277