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Segment, Geographic, Product and Significant Customer Information - Long-lived Tangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Long-lived tangible assets: |  |
Total long-lived tangible assets | $ 42,317 | $ 44,226
United States [Member] |  |
Long-lived tangible assets: |  |
Total long-lived tangible assets | 41,002 | 42,688
International [Member] |  |
Long-lived tangible assets: |  |
Total long-lived tangible assets | $ 1,315 | $ 1,538

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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