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Segment and Geographic Information - Schedule of Revenue by Geographic Area (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Revenue recognized | $ 125,668 | $ 179,577 | $ 180,828
Europe [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue recognized | 108,759 | 153,669 | 159,123
Japan [Member] | Related Party [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue recognized | 16,885 | 25,778 | 21,596
All other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue recognized | $ 24 | $ 130 | $ 109

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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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