Balance Sheet Components - Property, Plant and Equipment (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 6,453,000		$ 6,453,000
Less: Accumulated depreciation and amortization	(4,301,000)		(3,988,000)
Property and equipment, net	2,152,000		2,465,000
Depreciation expense	300,000	300,000
Distribution equipment (useful life of 5 years)
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Total property and equipment	5,475,000		5,475,000
Computer and office equipment (useful lives of 2 to 4 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	377,000		377,000
Computer and office equipment (useful lives of 2 to 4 years) | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Computer and office equipment (useful lives of 2 to 4 years) | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	4 years
Software (useful lives of 2 to 5 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	237,000		237,000
Software (useful lives of 2 to 5 years) | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Software (useful lives of 2 to 5 years) | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Leasehold improvements (useful lives of lesser of estimated life or lease term)
Property, Plant and Equipment [Line Items]
Total property and equipment	214,000		214,000
Furniture and fixtures (useful lives of 2 to 4 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 150,000		$ 150,000
Furniture and fixtures (useful lives of 2 to 4 years) | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Furniture and fixtures (useful lives of 2 to 4 years) | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	4 years