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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Customer Segment Unit	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Provision for doubtful accounts | $	$ 20	$ 20
Number of major customers | Customer	4
Percentage of revenue contributed by major customers	35.00%
Number of operating segments | Segment	1
Number of reporting units | Unit	1
Minimum [Member]
Property, Plant and Equipment [Line Items]
Remaining lease terms	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Remaining lease terms	9 years

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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