Balance Sheet Components - Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,696,000	$ 11,949,000
Less: Accumulated depreciation and amortization	(3,173,000)	(6,232,000)
Property and equipment, net	3,523,000	5,717,000
Depreciation and amortization expense	1,400,000	1,200,000	500,000
Computer and office equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	650,000	5,143,000
Computer and office equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Computer and office equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	4 years
Distribution equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Property and equipment, gross	5,290,000	5,394,000
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	143,000	347,000
Furniture and fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Furniture and fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	4 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	220,000	365,000
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 393,000	$ 700,000
Software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years