Intangible Assets (Tables)  | 
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2018  | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill and Intangible Assets Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Intangible Assets | 
 Our intangible assets consist of the following at December 31, 2018: 
 
  | 
||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  |