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Segment Reporting and Concentrations - Revenues by geographic region (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 13,846 | $ 14,049 | $ 41,179 | $ 42,439
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6,022 | 6,481 | 18,776 | 18,452
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,394 | 2,403 | 7,120 | 8,387
The Netherlands |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,730 | 1,896 | 5,146 | 5,485
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,634 | 1,459 | 4,594 | 4,397
Other - principally Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,066 | $ 1,810 | $ 5,543 | $ 5,718

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- 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 -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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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 No definition available. + Details
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- Details
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- Details
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