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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