Equipment, Furniture and Leasehold Improvements - Equipment, Furniture and Leasehold Improvements (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total	$ 3,431	$ 3,329
Less: accumulated depreciation and amortization	(2,520)	(2,340)
Equipment, furniture and leasehold improvements, net	911	989
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Total	1,637	1,819
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Total	302	321
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total	1,163	$ 1,189
Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Total	$ 329