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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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Number of major customers

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Total revenues from major customers.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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