Commitments and Contingencies - Operating Leases (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 31, 2014 San Francisco Office	May 31, 2014 San Francisco Office August 2017 To August 2020	Jul. 31, 2014 Santa Monica Lease	Jul. 31, 2014 Santa Monica Lease October, 2019 to October, 2025
Operating Leases
Lease term					10 years		15 years
Future minimum payments
Three months ending December 31, 2014	$ 663,000		$ 663,000
2015	5,149,000		5,149,000
2016	5,922,000		5,922,000
2017	5,201,000		5,201,000
2018	5,530,000		5,530,000
Thereafter	37,008,000		37,008,000
Total minimum lease payments	59,473,000		59,473,000		7,000,000		36,300,000
Rent expense and other operating lease disclosures
Rent expense	800,000	600,000	2,100,000	1,900,000
Irrevocable stand-by letter of credit					800,000		3,500,000
Letter of credit that is subject to annual reduction						$ 200,000		$ 1,200,000