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Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 1,097  
2019 1,375  
2020 114  
2021 114  
2022 114  
Thereafter 579  
Net $ 3,393 $ 4,565