Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 8,226	$ 8,102
Less: accumulated depreciation and amortization	(3,226)	(2,949)
Totals	5,000	5,153
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	3,878	3,878
Computer Equipment
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	1,890	1,822
Telephone Equipment
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	262	256
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,196	$ 2,146