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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) item Customers | Dec. 31, 2017 USD ($)
Provision for doubtful accounts | $ 20 | $ 20
Number of major customers | Customers | 3 |
Percentage of revenue contributed by major customers | 36.00% |
Number of operating segments | item | 1 |
Number of reporting units | item | 1 |
Lease assets | $ 3,400 |
Lease liabilities | $ 3,300 |
Maximum [Member] |  |
Estimated useful life | 3 years |

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