Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,826	$ 2,343
Less accumulated depreciation	(1,282)	(1,641)
Property and equipment, net	544	702
Vehicles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 32	32
Estimated Useful Lives	5 years
Trade equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 162	223
Estimated Useful Lives	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 292	317
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	2 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 16	77
Estimated Useful Lives	7 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,324	$ 1,694
Estimated Useful Lives	3 years