Commitments and Contingencies - San Francisco Office Lease (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Operating Leased Assets [Line Items]      
Property and equipment net, capitalized   $ 71,390 $ 30,731
Lease financing obligations, current   28,900 6,600
Lease      
Operating Leased Assets [Line Items]      
Total future minimum lease commitments amount   85,394  
San Francisco Office      
Operating Leased Assets [Line Items]      
Total future minimum lease commitments period 10 years    
Standby letter of credit $ 800    
Lease financing obligations, current   $ 6,800 6,600
Estimated useful life   40 years  
San Francisco Office | Debt Redemption Period August 1, 2017 to August 1, 2020      
Operating Leased Assets [Line Items]      
Amount of annual reduction of letter of credit 200    
San Francisco Office | Lease      
Operating Leased Assets [Line Items]      
Total future minimum lease commitments amount $ 7,000    
Capitalized facility leases | San Francisco Office      
Operating Leased Assets [Line Items]      
Property and equipment net, capitalized   $ 8,500 $ 6,600