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Restructuring Reserve - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Restructuring And Related Activities [Abstract]        
Restructuring charge $ 555      
Liability included in accrued compensation   $ 18 $ 92 $ 120