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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Finished products [1] $ 119 $ 1,199
Inventory, net $ 119 $ 1,199
[1] Includes $612 on December 31, 2017, with respect to inventory delivered to customers but for which revenue recognition criteria have not been met as of that date.