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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished products [1] $ 251 $ 1,199
Inventory, net $ 251 $ 1,199
[1] Includes amounts of $35 and $612 for 2018 and 2017, respectively, with respect to inventory delivered to customers but for which revenue criteria have not been met yet.