Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Mar. 31, 2018 |
|---|---|---|
| Finite Lived Intangible Assets [Line Items] | ||
| Cost | $ 5,826 | $ 5,826 |
| Accumulated Amortization | (4,930) | (4,595) |
| Net | 896 | 1,231 |
| Software | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Cost | 5,826 | 5,826 |
| Accumulated Amortization | (4,930) | (4,595) |
| Net | $ 896 | $ 1,231 |