Summary of Significant Accounting Policies - Property, Equipment and Software (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2015 | |
| Computer and other equipment | |
| Property, Plant and Equipment [Line Items] | |
| Useful lives | 3 years |
| Leasehold improvements | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives | Shorter of 10 years or lease term |
| Leasehold improvements | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Useful lives | 10 years |
| Office furniture | |
| Property, Plant and Equipment [Line Items] | |
| Useful lives | 5 years |
| Software | Minimum | |
| Property, Plant and Equipment [Line Items] | |
| Useful lives | 3 years |
| Software | Maximum | |
| Property, Plant and Equipment [Line Items] | |
| Useful lives | 5 years |