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Segment and Geographic Information - Schedule of Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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- Definition

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+ References

No definition available.

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