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Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Allowance for obsolescence $ 37 $ 24
Raw materials - current 14,800 19,388
Work-in-process 961 1,692
Inventory - current 15,761 21,080
Raw materials - long term (net of allowances of $37 and $24, respectively) 1,123 1,068
Inventory - total $ 16,884 $ 22,148