Balance Sheet Components - Property and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 130,038		$ 126,093
Less: accumulated depreciation	(53,719)		(49,132)
Property and equipment, net	76,319		76,961
Depreciation	4,800	$ 4,800
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	42,581		40,721
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,676		17,420
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,969		2,879
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,619		29,498
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	35,154		35,154
Construction-in-process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,039		$ 421