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Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) | 12 Months Ended
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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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