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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Inventory Disclosure [Abstract]      
Finished goods $ 18,266   $ 17,967
Work in process 2,297   3,681
Raw materials 48,728   55,781
Obsolescence reserve (34,179)   (32,050)
Total 35,112   45,379
Less current portion (21,531) $ (23,907) (23,855)
Non-current portion $ 13,581 $ 19,223 $ 21,524