| Summary of Significant Accounting Policies - Intangibles (Details) | 12 Months Ended | 
|---|---|
| Dec. 31, 2018 | |
| Licensed IP rights - completed technology used in R&D | Weighted Average | |
| Intangibles | |
| Weighted-average amortization period (in years) | 7 years | 
| Acquired software licenses | |
| Intangibles | |
| Estimated useful life (in years) | 3 years | 
| X | ||||||||||
| 
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available. 
 | 
| X | ||||||||||
| 
- References No definition available. 
 | 
| X | ||||||||||
| 
- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available. 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Details 
 |