Property and Equipment, Net - Property and Equipment, Net by Geographic Area (Parenthetical) (Details) - Country |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Geographic Concentrations | Property and Equipment Net | Rest of World | ||
| Revenues From External Customers And Long Lived Assets [Line Items] | ||
| Number of individual country exceeded 10% of total property and equipment | 0 | 0 |