Balance Sheet Components - Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 6,453,000	$ 6,696,000
Less: Accumulated depreciation and amortization	(3,988,000)	(3,173,000)
Property and equipment, net	2,465,000	3,523,000
Depreciation and amortization expense	1,300,000	1,400,000	1,200,000
Computer and office equipment (useful lives of 2 to 4 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	377,000	650,000
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
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	5,290,000
Furniture and fixtures (useful lives of 2 to 4 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	150,000	143,000
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
Leasehold improvements (useful lives of lesser of estimated life or lease term)
Property, Plant and Equipment [Line Items]
Total property and equipment	214,000	220,000
Software (useful lives of 2 to 5 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 237,000	$ 393,000
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