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Intangible Assets - Schedule of Expected Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 340  
2020 340  
2021 340  
2022 340  
2023 340  
Thereafter 1,530  
Total $ 3,230 $ 301