Significant Accounting Policies - Intangible Assets (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2015 | |
| Purchased software | |
| Finite-Lived Intangible Assets [Line Items] | |
| Useful life | 3 years |
| Other Intangible Assets | |
| Finite-Lived Intangible Assets [Line Items] | |
| Useful life | 3 years |
| Software development costs | |
| Finite-Lived Intangible Assets [Line Items] | |
| Useful life | 3 years |