Revenue recognition Revenue Recognition (Details) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Revenue from Contract with Customer [Abstract] | ||
| Revenue from products transferred to customer at a single point in time | 100.00% | 100.00% |
| X | ||||||||||
- Definition Percentage Of Revenue, Accounted Products Transferred To Customers No definition available.
|
| X | ||||||||||
- References No definition available.
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