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Fair Value Measurements - Transfers between levels (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair Value Measurements    
Transfer of Level 1 to level 2 $ 0 $ 0
Transfer of Level 2 to level 1 0 0
Transfer into level 3 0 0
Transfer out level 3 $ 0 $ 0