Commitments and Contingencies - Schedule of Operating Lease Spaces Currently Utilized (Detail)	12 Months Ended
	Dec. 31, 2015
Palo Alto, California [Member] | Headquarters [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	March 2020
Portland, Oregon office [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	September 2018
San Francisco, California office [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	October 2022
Boulder, Colorado office [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	March 2016
United Kingdom office [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	May 2018
Israel office [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	February 2021
Arizona data center [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	December 2016
New Jersey data center [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	September 2016
Netherlands data center [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	October 2016
London data center [Member]
Operating Leased Assets [Line Items]
Operating lease expiration period	March 2017