Balance Sheet Components - Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 126,093	$ 110,045
Less: accumulated depreciation	(49,132)	(30,339)
Property and equipment, net	76,961	79,706
Depreciation	19,400	13,400	$ 10,000
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,721	29,101
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,420	12,630
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,879	2,380
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,498	24,372
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	$ 421	$ 6,408