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Organization and significant accounting policies - Narrative (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 19, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) reporting_unit reportable_segment | Dec. 31, 2022 USD ($) | Sep. 20, 2022 USD ($)
Short-Term Debt [Line Items] |  |  |  |  |
Number of reportable segments | reportable_segment |  |  | 1 |  |
Number of reporting units | reporting_unit |  |  | 1 |  |
Cash, cash equivalents, and available-for-sale securities |  | $ 42,200,000 | $ 42,200,000 | $ 64,100,000 |
Subsequent Event | Casdin Securities Purchase Agreement |  |  |  |  |
Short-Term Debt [Line Items] |  |  |  |  |
Number of shares sold (in shares) | shares | 927,165 |  |  |  |
Shares sold, price per share (in dollars per share) | $ / shares | $ 11.19 |  |  |  |
Consideration received on sale of stock | $ 10,374,976.35 |  |  |  |
Supplier Concentration Risk | Supply Purchase | One Supplier |  |  |  |  |
Short-Term Debt [Line Items] |  |  |  |  |
Concentration risk, percent |  | 14.00% | 12.00% |  |
Supplier Concentration Risk | Accounts Payable | One Supplier |  |  |  |  |
Short-Term Debt [Line Items] |  |  |  |  |
Concentration risk, percent |  |  | 19.00% | 23.00% |
2022 term loan 3 |  |  |  |  |
Short-Term Debt [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 10,000,000 | $ 10,000,000 |  | $ 30,000,000

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