Operating Leases - Narrative (Detail) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2016 ft² Location	Dec. 31, 2015 USD ($)
Leases [Abstract]
Area of operating lease \| ft²	42,400
Number of office space locations \| Location	2
Operating lease expense excluding rent \| $		$ 0.4

The number of units (items of property) under operating lease arrangements.

No definition available.

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNumberOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant