Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 8,383	$ 11,731
Accumulated depreciation and amortization	(6,794)	(9,692)
Property and equipment, net	1,589	2,039
Depreciation expense	$ 801	761
Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	2 years
Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	10 years
Office furniture and equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 4,412	7,234
Office furniture and equipment | Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	10 years
Leasehold improvements
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 1,488	1,474
Leasehold improvements | Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	1 year
Leasehold improvements | Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	6 years
Manufacturing and test equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, gross	$ 2,483	$ 3,023
Manufacturing and test equipment | Minimum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	2 years
Manufacturing and test equipment | Maximum
Property, Plant and Equipment, Net, by Type [Abstract]
Property and equipment, useful life	10 years