Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Estimated Future Amortization Expense (Detail)

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Intangible Assets - Estimated Future Amortization Expense (Detail) - USD ($)
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
2019 $ 1,231,000      
Thereafter 0      
Net $ 1,231,000 $ 2,647,000 $ 12,490,000 $ 19,967,000