Balance Sheet Components - Property and Equipment, net (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 122,936,000		$ 122,936,000		$ 110,045,000
Less: accumulated depreciation	(44,789,000)		(44,789,000)		(30,339,000)
Property and equipment, net	78,147,000		78,147,000		79,706,000
Depreciation	5,100,000	$ 3,400,000	14,800,000	$ 9,700,000
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	38,269,000		38,269,000		29,101,000
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,840,000		16,840,000		12,630,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,865,000		2,865,000		2,380,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,504,000		29,504,000		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	304,000		304,000		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