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Goodwill and Purchased Intangibles Assets - Schedule of Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (remaining 3 months) $ 440  
2020 1,496  
2021 972  
2022 486  
Net Carrying Amount $ 3,394 $ 1,312