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Composition of Certain Financial Statement Captions - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Accounts Receivable Net Current [Abstract]    
Accounts receivable, gross $ 89,635 $ 94,358
Sales return reserve   (5,520)
Allowance for doubtful accounts (4,087) (3,876)
Accounts receivable, net $ 85,548 $ 84,962