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Composition of Certain Financial Statement Captions - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Accounts Receivable Net Current [Abstract]    
Accounts receivable, gross $ 88,934 $ 94,358
Sales return reserve   (5,520)
Allowance for doubtful accounts (4,574) (3,876)
Accounts receivable, net $ 84,360 $ 84,962