Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Number of reportable segment \| Segment	1
Fair value of investments denominated in Euros \| $	$ 0.8	$ 0.7

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration