Intangible Assets (Details) - USD ($) $ in Thousands  | 
Dec. 31, 2017  | 
Jun. 30, 2017  | 
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross carrying value | $ 5,494 | $ 5,446 | 
| Finite-Lived Intangible Assets, Accumulated Amortization | (3,792) | (3,623) | 
| Net intangible assets | 1,702 | 1,823 | 
| 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 | (2,166) | (2,088) | 
| Patents [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Finite-Lived Intangible Assets, Gross carrying value | 2,394 | 2,346 | 
| Finite-Lived Intangible Assets, Accumulated Amortization | $ (1,626) | $ (1,535) | 
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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