Commitments and Contingencies - Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Future minimum payment commitments required under non-cancellable office space, co-location agreements and third-party licenses
2017	$ 21,948
2018	5,028
2019	4,835
2020	5,066
2021	4,133
2022 and thereafter	10,642
Total minimum operating commitments	51,652
Less: non-cancelable sublease income	(7,578)
Total operating commitments	44,074
Legal Contingencies
Reserves recorded	0	$ 0
Former Headquarters
Letters of Credit
Outstanding letters of credit	450	600
Mountain View, CA
Letters of Credit
Outstanding letters of credit	320
Operating income
Operating Commitments
Rent expense	3,493	3,295	$ 1,733
Other income, net
Operating Commitments
Rent expense	1,292	353
Rent income	$ 1,686	$ 578