Commitments and Contingencies - Additional Information (Details) - USD ($)		1 Months Ended	12 Months Ended
	Aug. 26, 2016	Aug. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
Rent expense			$ 8,100,000	$ 5,400,000	$ 2,100,000
Lease term		120 months
Recorded assets			126,093,000	110,045,000
Lease financing obligation			41,200,000	42,500,000
Lease financing obligation, current			1,600,000
Lease financing obligations, non-current			39,593,000	41,210,000
Lease expense under financing obligation			1,300,000	1,300,000	$ 1,200,000
Non-cancelable purchase commitments			261,900,000
Cisco Systems, Inc.
Long-term Purchase Commitment [Line Items]
Minimum monetary sanction for violation of cease and desist order	$ 100,000.00
Other Assets
Long-term Purchase Commitment [Line Items]
Restricted deposits			63,100,000	2,300,000
Building and improvements
Long-term Purchase Commitment [Line Items]
Recorded assets			53,400,000	$ 53,400,000
Line of Credit | Letter of Credit
Long-term Purchase Commitment [Line Items]
Letter of credit			$ 4,000,000