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Inventory (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Inventory    
Raw materials $ 9,871,000 $ 13,041,000
Work in process 1,536,000 1,818,000
Finished goods 3,826,000 6,823,000
Inventory, Net $ 15,233,000 $ 21,682,000