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 9 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Intangible Assets          
Intangible Assets, Gross $ 7,706   $ 7,706   $ 7,706
Accumulated Amortization 7,463   7,463   7,295
Intangible Assets, Net 243   243   411
Amortization expense 100 $ 100 200 $ 200  
Expected future amortization expense of intangible assets          
2019 (remainder of fiscal year) 56   56    
2020 187   187    
Intangible Assets, Net 243   $ 243   $ 411
Manufacturing license          
Intangible Assets          
Weighted Average Amortization Period     17 years   17 years
Intangible Assets, Gross 3,700   $ 3,700   $ 3,700
Accumulated Amortization 3,700   $ 3,700   $ 3,700
Technology          
Intangible Assets          
Weighted Average Amortization Period     10 years   10 years
Intangible Assets, Gross 2,240   $ 2,240   $ 2,240
Accumulated Amortization 1,997   1,997   1,829
Intangible Assets, Net 243   243   411
Expected future amortization expense of intangible assets          
Intangible Assets, Net 243   243   411
Trade Name and Parts, Service and TA100 Customer Relationships          
Intangible Assets          
Intangible Assets, Gross 1,766   1,766   1,766
Accumulated Amortization $ 1,766   $ 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