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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 58,240	$ 55,858
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	7,806	8,092
United States
Segment Reporting Information [Line Items]
Revenues	26,764	25,015
United Kingdom
Segment Reporting Information [Line Items]
Revenues	11,184	9,577
The Netherlands
Segment Reporting Information [Line Items]
Revenues	6,695	6,982
Canada
Segment Reporting Information [Line Items]
Revenues	$ 5,791	$ 6,192

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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