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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 15,967	$ 14,530
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	1,696	1,880
United States
Segment Reporting Information [Line Items]
Revenues	8,220	6,694
United Kingdom
Segment Reporting Information [Line Items]
Revenues	2,802	2,771
The Netherlands
Segment Reporting Information [Line Items]
Revenues	1,654	1,640
Canada
Segment Reporting Information [Line Items]
Revenues	$ 1,595	$ 1,545

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
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

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