Intangible Assets (Details) - USD ($) $ in Thousands |
Sep. 30, 2018 |
Jun. 30, 2018 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross carrying value | $ 5,601 | $ 5,584 |
| Finite-Lived Intangible Assets, Accumulated Amortization | (4,047) | (3,964) |
| Net intangible assets | 1,554 | 1,620 |
| Intellectual Property [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross carrying value | 3,100 | 3,100 |
| Finite-Lived Intangible Assets, Accumulated Amortization | (2,282) | (2,243) |
| Patents [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross carrying value | 2,501 | 2,484 |
| Finite-Lived Intangible Assets, Accumulated Amortization | $ (1,765) | $ (1,721) |