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Restructuring Charge - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Restructuring And Related Activities [Abstract]      
Restructuring charge $ 316 $ 316 $ 630
Liability included in accrued compensation   $ 18 $ 120