Intangible Assets (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Mar. 31, 2018 |
Mar. 31, 2017 |
| Intangible Assets |
|
|
| Intangible Assets, Gross |
$ 7,706
|
$ 7,706
|
| Accumulated Amortization |
7,295
|
7,055
|
| Intangible Assets, Net |
411
|
651
|
| Amortization expense |
300
|
300
|
| Expected future amortization expense of intangible assets |
|
|
| 2019 |
224
|
|
| 2020 |
187
|
|
| Intangible Assets, Net |
$ 411
|
$ 651
|
| Manufacturing license |
|
|
| Intangible Assets |
|
|
| Weighted Average Amortization Period |
17 years
|
17 years
|
| Intangible Assets, Gross |
$ 3,700
|
$ 3,700
|
| Accumulated Amortization |
$ 3,700
|
3,684
|
| Intangible Assets, Net |
|
16
|
| Expected future amortization expense of intangible assets |
|
|
| Intangible Assets, Net |
|
$ 16
|
| Technology |
|
|
| Intangible Assets |
|
|
| Weighted Average Amortization Period |
10 years
|
10 years
|
| Intangible Assets, Gross |
$ 2,240
|
$ 2,240
|
| Accumulated Amortization |
1,829
|
1,605
|
| Intangible Assets, Net |
411
|
635
|
| Expected future amortization expense of intangible assets |
|
|
| Intangible Assets, Net |
411
|
635
|
| 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
|