Geographical Information (Details) $ in Thousands |
3 Months Ended | |
|---|---|---|
|
Jun. 30, 2018
USD ($)
item
|
Mar. 31, 2018
USD ($)
|
|
| Geographical Information | ||
| Number of operating geographic regions | item | 2 | |
| Long-lived assets | $ 443 | $ 370 |
| United States | ||
| Geographical Information | ||
| Long-lived assets | 18 | 20 |
| United Kingdom | ||
| Geographical Information | ||
| Long-lived assets | $ 425 | $ 350 |