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Inventory (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory    
Raw materials $ 10,345 $ 7,544
Work-in-process 477 227
Finished goods 2,662 2,764
Inventory, Net, Total $ 13,484 10,535
Step up inventory related to acquisition   $ 800