Fixed Assets - Summary of Equipment and Leasehold Improvements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	$ 628	$ 1,367
Less, accumulated depreciation and amortization	588	1,355
Equipment and leasehold improvements, net	40	12
Equipment [Member]
Property, Plant and Equipment [Line Items]
Equipment and leasehold improvements, gross	601	1,306
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Equipment, useful lives in years	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Equipment, useful lives in years	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements, useful lives in years	Term of lease
Equipment and leasehold improvements, gross	$ 27	$ 61