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Income Per Share - Reconciliation of Numerators and Denominators of Basic and Diluted Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Numerator:        
Net income (loss) $ 95 $ (11,622) $ 4,245 $ (10,677)
Denominator:        
Weighted average common shares outstanding 9,832 9,768 9,817 9,762
Basic income (loss) per share $ 0.01 $ (1.19) $ 0.43 $ (1.09)
Numerator:        
Net income (loss) $ 95 $ (11,622) $ 4,245 $ (10,677)
Denominator:        
Weighted average common shares outstanding 9,832 9,768 9,817 9,762
Stock options outstanding 13   15  
Weighted average common and potential common shares outstanding 9,845 9,768 9,832 9,762
Diluted income (loss) per share $ 0.01 $ (1.19) $ 0.43 $ (1.09)