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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 16, 2015, the Company entered into a lease agreement for additional office space in San Francisco, California. The lease agreement commences in the second quarter of 2015 with delivery of portions of the leased space to occur in stages through March 2017. The lease agreement expires on March 31, 2026, with the right to renew the lease term for two consecutive renewal terms of five years each. Expected annual minimum lease payments related to this additional office space are $0.4 million, $4 million and $6 million, respectively, for fiscal years 2015, 2016 and 2017. Expected annual minimum lease payments are $7 million to $9 million from 2018-2025 and $2 million in 2026.