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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 14,553	$ 13,846	$ 42,946	$ 41,179
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	1,970	2,121	5,794	5,812
United States
Segment Reporting Information [Line Items]
Revenues	6,613	5,967	19,561	18,507
United Kingdom
Segment Reporting Information [Line Items]
Revenues	2,832	2,394	8,284	7,120
The Netherlands
Segment Reporting Information [Line Items]
Revenues	1,704	1,730	5,003	5,146
Canada
Segment Reporting Information [Line Items]
Revenues	$ 1,434	$ 1,634	$ 4,304	$ 4,594

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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: 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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