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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 17,049	$ 13,863	$ 33,016	$ 28,393
Other - principally Europe
Segment Reporting Information [Line Items]
Revenues	1,880	1,940	3,576	3,824
United States
Segment Reporting Information [Line Items]
Revenues	9,074	6,258	17,294	12,948
United Kingdom
Segment Reporting Information [Line Items]
Revenues	2,995	2,681	5,797	5,452
The Netherlands
Segment Reporting Information [Line Items]
Revenues	1,608	1,659	3,262	3,299
Canada
Segment Reporting Information [Line Items]
Revenues	$ 1,492	$ 1,325	$ 3,087	$ 2,870

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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Reference 3: 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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