Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total	$ 110,385	$ 71,356
Less: Accumulated depreciation and amortization	(42,741)	(29,800)
Property and equipment, net	67,644	41,556
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total	24,050	22,787
Computers, Software, Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Total	42,936	24,636
Tooling [Member]
Property, Plant and Equipment [Line Items]
Total	19,876	16,159
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total	19,507	3,944
Tradeshow Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Total	$ 4,016	$ 3,830
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Minimum [Member] | Computers, Software, Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Minimum [Member] | Tooling [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	1 year
Minimum [Member] | Tradeshow Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Maximum [Member] | Computers, Software, Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	4 years
Maximum [Member] | Tooling [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Maximum [Member] | Tradeshow Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years