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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished products [1] $ 702 $ 251
Inventory, net $ 702 $ 251
[1] Including inventory delivered to customers but for which revenue recognition criteria have not been met in the amount of $486 and $35 as of June 30, 2019 and December 31, 2018, respectively.