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The Company and Its Accounting Policies - Reconciliation of Numerators and Denominators of Basic and Diluted (Loss) Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Numerator:                      
Net income (loss) $ 576 $ 9 $ 1,205 $ 82 $ (4,553) $ 95 $ 1,827 $ 2,323 $ 1,872 $ (308) $ (9,844)
Denominator:                      
Weighted average common shares and SEUs outstanding                 9,876 9,823 9,764
Basic income (loss) per share $ 0.06   $ 0.12 $ 0.01 $ (0.46) $ 0.01 $ 0.19 $ 0.24 $ 0.19 $ (0.03) $ (1.01)
Numerator:                      
Net income (loss) $ 576 $ 9 $ 1,205 $ 82 $ (4,553) $ 95 $ 1,827 $ 2,323 $ 1,872 $ (308) $ (9,844)
Denominator:                      
Weighted average common shares and SEUs outstanding                 9,876 9,823 9,764
Stock options outstanding                 3    
Weighted average common and potential common shares outstanding                 9,879 9,823 9,764
Diluted income (loss) per share $ 0.06   $ 0.12 $ 0.01 $ (0.46) $ 0.01 $ 0.19 $ 0.24 $ 0.19 $ (0.03) $ (1.01)