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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Inventory      
Raw materials $ 682 $ 682  
Work-in-process   708  
Finished goods 1,270 595  
Total inventory 1,952 $ 1,985  
Inventory write-downs $ 0   $ 0