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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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.

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