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Summary of Significant Accounting Policies (Details 6) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred revenues | $ 75 | $ 1,248
Balances excluding revenue standard [Member] |  |
Deferred revenues | 213 |
Impact of Revenue Standard [Member] |  |
Deferred revenues | $ (138) |

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Period Type: | instant

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Balance Type: |
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- Details
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Balance Type: |
Period Type: |