Segment Information (Narrative) (Details) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2020
segment
customer
|
Sep. 30, 2019
segment
customer
|
Sep. 30, 2020
segment
customer
|
Sep. 30, 2019
segment
customer
|
|
| United States And Canada [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Number of operating segments | segment | 1 | 1 | 1 | 1 |
| Revenue [Member] | One Major Customer [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Number of customers | 1 | 1 | ||
| Customer, percentage | 29.00% | 25.00% | ||
| Revenue [Member] | Three Major Customers [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Number of customers | 3 | 3 | ||
| Customer, percentage | 43.00% | 44.00% | ||