Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Intangible Assets      
Intangible Assets, Gross $ 7,706   $ 7,706
Accumulated Amortization 7,351   7,295
Intangible Assets, Net 355   411
Amortization expense 100 $ 100  
Expected future amortization expense of intangible assets      
2019 (remainder of fiscal year) 168    
2020 187    
Intangible Assets, Net $ 355   $ 411
Manufacturing license      
Intangible Assets      
Weighted Average Amortization Period 17 years   17 years
Intangible Assets, Gross $ 3,700   $ 3,700
Accumulated Amortization $ 3,700   $ 3,700
Technology      
Intangible Assets      
Weighted Average Amortization Period 10 years   10 years
Intangible Assets, Gross $ 2,240   $ 2,240
Accumulated Amortization 1,885   1,829
Intangible Assets, Net 355   411
Expected future amortization expense of intangible assets      
Intangible Assets, Net 355   411
Trade Name and Parts, Service and TA100 Customer Relationships      
Intangible Assets      
Intangible Assets, Gross 1,766   1,766
Accumulated Amortization $ 1,766   $ 1,766
Minimum | Trade Name and Parts, Service and TA100 Customer Relationships      
Intangible Assets      
Weighted Average Amortization Period 1 year 2 months 12 days   1 year 2 months 12 days
Maximum | Trade Name and Parts, Service and TA100 Customer Relationships      
Intangible Assets      
Weighted Average Amortization Period 5 years   5 years