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Inventories (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Inventory Disclosure [Abstract]        
Carrying amount of inventories to net realizable $ 0 $ 37 $ 255 $ 730