Segment Reporting and Significant Customers (Details) $ in Thousands |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2018
USD ($)
segment
|
Mar. 31, 2017
USD ($)
|
|
| Segment Reporting and Significant Customers | ||
| Number of reporting segment | segment | 1 | |
| Total revenue | $ 10,042 | $ 5,297 |
| United States | ||
| Segment Reporting and Significant Customers | ||
| Total revenue | 8,744 | 4,508 |
| Europe | ||
| Segment Reporting and Significant Customers | ||
| Total revenue | $ 1,298 | $ 789 |