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Operating Leases - Narrative (Detail) $ in Millions	9 Months Ended	12 Months Ended
Operating Leases - Narrative (Detail) $ in Millions	Sep. 30, 2015 ft² Location	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Operating Leased Assets [Line Items]
Area of operating lease \| ft²	42,400
Number of office space locations \| Location	2
Operating lease expense excluding rent			$ 0.3
Lease Forecast
Operating Leased Assets [Line Items]
Operating lease expense excluding rent		$ 0.4