Balance Sheet Components - Property and Equipment, net (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 119,478,000		$ 119,478,000		$ 110,045,000
Less: accumulated depreciation	(39,797,000)		(39,797,000)		(30,339,000)
Property and equipment, net	79,681,000		79,681,000		79,706,000
Depreciation	4,800,000	$ 3,300,000	9,700,000	$ 6,200,000
Line of Credit | Letter of Credit
Property, Plant and Equipment [Line Items]
Letter of credit	4,000,000		4,000,000
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,062,000		36,062,000		29,101,000
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,600,000		15,600,000		12,630,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,853,000		2,853,000		2,380,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,466,000		29,466,000		24,372,000
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	35,154,000		35,154,000		35,154,000
Construction-in-process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	343,000		343,000		6,408,000
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 53,400,000		$ 53,400,000		$ 53,400,000