Balance Sheet Components - Property, Plant and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 6,617,000		$ 6,617,000		$ 6,453,000
Less: Accumulated depreciation and amortization	(4,817,000)		(4,817,000)		(3,988,000)
Property and equipment, net	1,800,000		1,800,000		2,465,000
Depreciation expense	300,000	300,000	900,000	1,000,000
Distribution equipment (useful lives of lesser of 7 years or contract term)
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			7 years
Total property and equipment	5,509,000		5,509,000		5,475,000
Computer and office equipment (useful lives of 3 to 5 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	409,000		409,000		377,000
Computer and office equipment (useful lives of 3 to 5 years) | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			3 years
Computer and office equipment (useful lives of 3 to 5 years) | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			5 years
Software, including internal-use software (useful lives of 3 years)
Property, Plant and Equipment [Line Items]
Total property and equipment	329,000		329,000		237,000
Capitalized costs associated with internal-use software			200,000
Software, including internal-use software (useful lives of 3 years) | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			3 years
Leasehold improvements (useful lives of lesser of estimated life or lease term)
Property, Plant and Equipment [Line Items]
Total property and equipment	219,000		219,000		214,000
Furniture and fixtures (useful lives of 5 years)
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			5 years
Total property and equipment	$ 151,000		$ 151,000		$ 150,000