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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Inventories    
Raw materials $ 871 $ 944
Work in process 2,480 2,879
Finished goods 578 353
Total inventories, net 3,929 4,176
Less: noncurrent inventories 1,451 2,194
Current inventories $ 2,478 $ 1,982