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Fair value of financial instruments and marketable securities - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | $ 421,855 |  | $ 421,855 |  | $ 259,778
Gross Unrealized, Gain | 39 |  | 39 |  | 340
Gross Unrealized, Loss | (269) |  | (269) |  | (14)
Fair Value | 421,625 |  | 421,625 |  | 260,104
Write downs of available for sale debt securities | 0 | $ 0 | 0 | $ 0 |
Increase in allowance for credit losses | 0 | 0 | 0 | 0 |
Realized gain (loss) from sale of marketable securities | 0 | $ (300) | 0 | $ (300) |
Commercial paper |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 133,081 |  | 133,081 |  | 117,044
Gross Unrealized, Gain |  |  |  |  | 128
Gross Unrealized, Loss | (113) |  | (113) |  | (12)
Fair Value | 132,968 |  | 132,968 |  | 117,160
Corporate debt securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 14,906 |  | 14,906 |  | 1,650
Gross Unrealized, Loss | (7) |  | (7) |  | (2)
Fair Value | 14,899 |  | 14,899 |  | 1,648
Government obligations |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 273,868 |  | 273,868 |  | 141,084
Gross Unrealized, Gain | 39 |  | 39 |  | 212
Gross Unrealized, Loss | (149) |  | (149) |  |
Fair Value | $ 273,758 |  | $ 273,758 |  | $ 141,296

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