Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 130,435	$ 120,290
Less: Accumulated depreciation and amortization	(63,910)	(50,240)
Property and equipment, net	66,525	70,050
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	42,369	40,841
Production, engineering and other equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	26,957	25,174
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	20,156	19,537
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	15,971	14,581
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	12,006	11,389
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	6,528	4,632
Tradeshow Equipment and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	6,448	$ 4,136
Leasehold Improvements and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Expected accelerated depreciation, next 13 months	7,000
Expected accelerated depreciation, next quarter	4,000
Expected accelerated depreciation, remaining period	$ 3,000