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Segment Reporting and Significant Customer Information - Revenue for Individual Countries that Exceed 10% of Total Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | $ 24,687 | $ 26,823 | $ 79,527 | $ 87,450
United States |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 13,658 | 14,467 | 45,127 | 47,845
United Kingdom |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 4,483 | 4,994 | 14,136 | 17,518
GERMANY |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 2,881 | 3,042 | 9,047 | 9,436
Rest of the world |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | $ 3,665 | $ 4,320 | $ 11,217 | $ 12,651

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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