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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]      
Raw materials $ 3,590 $ 4,064  
Finished goods 5,636 5,749  
Reserves for excess, obsolete, and slow-moving inventories (3,326) (3,645) $ (4,212)
Inventories, net $ 5,900 $ 6,168