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Commitments and Contingencies (Long-term Supply Agreement) (Details) - Third-party Manufacturing
$ in Thousands
12 Months Ended
Mar. 31, 2017
USD ($)
Long-term Purchase Commitment [Line Items]  
Supply agreement, term 10 years
2018 $ 1,013
2019 982
2020 559
2021 0
2022 0
Thereafter 0
Total purchase commitment $ 2,554