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Summary of Significant Accounting Policies - Accounts receivable (Details) | Mar. 31, 2024 USD ($) customer | Dec. 31, 2023 USD ($) | Mar. 31, 2023 customer
--- | --- | --- | ---
Accounts receivable |  |  |
Number of customers | customer |  |  | 2
Accounts receivable | $ 8,404,000 | $ 821,000 |
Allowance for doubtful accounts | 0 |  |
Customer Concentration Risk |  |  |
Accounts receivable |  |  |
Accounts receivable | 8,404,000 | $ 821,000 |
Customer Concentration Risk | Genentech, Inc. |  |  |
Accounts receivable |  |  |
Accounts receivable | $ 0 |  |
Customer Concentration Risk | Genentech and GSK Customers |  |  |
Accounts receivable |  |  |
Number of customers | customer | 2 |  |

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