Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
Collaborative arrangement revenue	$ 4,346	$ 29,034	$ 9,060	$ 58,406
Total revenues	8,967	36,048	21,402	77,669
Operating expenses:
Research and development	16,013	59,980	59,944	128,226
Cost of manufacturing for commercial collaboration	3,453	3,610	6,722	7,264
Selling, general and administrative	9,857	19,489	22,516	40,209
Share of collaboration loss	0	0	1,230	0
Restructuring expenses	7,398	0	11,628	0
Cost of royalty and other revenue	0	907	0	1,548
Change in fair value of contingent consideration	(685)	53	(2,415)	126
Total operating expenses	36,036	84,039	99,625	177,373
Loss from operations	(27,069)	(47,991)	(78,223)	(99,704)
Interest income, net	2,527	3,090	5,388	5,139
Other income, net	1,434	2,812	2,080	5,455
Income (loss) before income taxes	24,879	(42,089)	(27,794)	(89,110)
Income tax (expense) benefit	0	0	0	0
Net income (loss)	$ 24,879	$ (42,089)	$ (27,794)	$ (89,110)
Net income (loss) per share - basic (in dollars per share)	$ 0.48	$ (0.83)	$ (0.53)	$ (1.89)
Net income (loss) per share - diluted (in dollars per share)	$ 0.45	$ (0.83)	$ (0.53)	$ (1.89)
Weighted-average number of common shares used in computing net (income) loss per share - basic (in shares)	52,186,000	50,966,000	52,129,000	47,238,000
Weighted-average number of common shares used in computing net (income) loss per share - diluted (in shares)	55,011,000	50,966,000	52,129,000	47,238,000
Other comprehensive income (loss):
Other comprehensive income (loss), net of tax benefit (expense) of $0.0 million and $0.0 million for the three and six months ended June 30, 2024 and 2023, respectively.	$ 100	$ 520	$ (32)	$ 1,447
Comprehensive income (loss)	24,979	(41,569)	(27,826)	(87,663)
Regeneron
Operating expenses:
Loss on assets held for sale to Regeneron	0	0	(5,026)	0
Novo Nordisk
Operating expenses:
Loss on assets held for sale to Regeneron	47,987	0	47,987	0
Service revenue
Revenue:
Revenue	4,621	5,022	12,342	15,848
Royalty and other revenue
Revenue:
Revenue	$ 0	$ 1,992	$ 0	$ 3,415