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Investments - Investments consists of available-for-sale securities (Details) - Short Term Marketable Securities [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 50,091 | $ 80,339
Unrealized Gain | 0 | 8
Unrealized Loss | (11) | (366)
Estimated Fair Value | 50,080 | 79,981
US Treasury Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 31,746 | 30,628
Unrealized Gain | 0 | 0
Unrealized Loss | (9) | (177)
Estimated Fair Value | 31,737 | 30,451
Commercial paper |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 3,222 | 29,543
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated Fair Value | 3,222 | 29,543
Corporate Bonds [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 2,000 | 16,815
Unrealized Gain | 0 | 0
Unrealized Loss | (0) | (189)
Estimated Fair Value | 2,000 | 16,626
US Government Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 13,123 | 3,353
Unrealized Gain | 0 | 8
Unrealized Loss | (2) | 0
Estimated Fair Value | $ 13,121 | $ 3,361

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