Balance Sheet Components Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$ 14,030	$ 10,477
Less: Accumulated depreciation	(8,665)	(6,846)
Property and equipment, net	5,365	3,631	2,701
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	7,345	4,127
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	924	886
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	2,125	1,654
Manufacturing tools and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	3,081	2,710
Construction in process
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$ 555	$ 1,100