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Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) financialInstitution bank	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Concentration Risk [Line Items]
Commercial banks where cash and cash equivalents are maintained | bank	2
Financial institutions where marketable securities are maintained | financialInstitution	1
Accounts receivable, allowance for credit loss	$ 0	$ 0
Total revenues	829,253,000	660,116,000	$ 443,310,000
Geographic Concentration Risk
Concentration Risk [Line Items]
Total revenues	829,253,000	660,116,000	443,310,000
United States | Geographic Concentration Risk
Concentration Risk [Line Items]
Total revenues	587,196,000	437,989,000	293,089,000
Switzerland | Geographic Concentration Risk
Concentration Risk [Line Items]
Total revenues	149,024,000	166,836,000	134,117,000
Belgium | Geographic Concentration Risk
Concentration Risk [Line Items]
Total revenues	58,354,000	2,088,000	199,000
Japan | Geographic Concentration Risk
Concentration Risk [Line Items]
Total revenues	15,096,000	47,939,000	11,934,000
All other foreign | Geographic Concentration Risk
Concentration Risk [Line Items]
Total revenues	$ 19,583,000	$ 5,264,000	$ 3,971,000
Jansen and Roche | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage (instant date)	69.00%
Janssen, Roche and Takeda | Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage (instant date)		52.00%
Partner A | Sales | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	44.00%	46.00%	48.00%
Partner B | Sales | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%	20.00%	25.00%
Partner C | Sales | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	0.00%	0.00%
Partner D | Sales | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	0.00%	0.00%	10.00%

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