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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Inventories    
Raw materials $ 1,334 $ 944
Work in process 2,194 2,879
Finished goods 191 353
Total inventories, net 3,719 4,176
Less: noncurrent inventories 1,351 2,194
Current inventories $ 2,368 $ 1,982