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Goodwill and Purchased Intangibles Assets - Schedule of Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 (remaining six months) $ 617  
2021 4,605  
2022 4,119  
2023 3,634  
Net Carrying Amount $ 12,975 $ 13,855