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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | $ 26,411 | $ 29,798 | $ 54,840 | $ 60,626
United States |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 15,244 | 16,585 | 31,469 | 33,378
United Kingdom |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 4,703 | 5,908 | 9,623 | 12,524
GERMANY |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 2,659 | 3,005 | 6,165 | 6,394
Rest of the world |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | $ 3,805 | $ 4,300 | $ 7,583 | $ 8,330

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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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