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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value Measurements      
Amount of asset transferred into level 3 $ 0 $ 0  
Amount of asset transferred out of level 3   0  
Amount of liability transferred into level 3 0 0  
Amount of liability transferred out of level 3 0 $ 0  
Recurring | Money market funds      
Fair Value Measurements      
Cash and cash equivalents 287   $ 634
Recurring | Level 1 | Money market funds      
Fair Value Measurements      
Cash and cash equivalents $ 287   $ 634