Summary of Significant Accounting Policies - Property and Equipment (Details) |
12 Months Ended |
---|---|
Dec. 31, 2019 | |
Minimum | |
Property, Plant and Equipment [Line Items] | |
Property, plant and equipment, useful life | 3 years |
Maximum | |
Property, Plant and Equipment [Line Items] | |
Property, plant and equipment, useful life | 59 years |