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Summary of Business and Significant Accounting Policies - Net Income (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Net Income (Loss) Per Common Share                    
Net income (loss) $ 166 $ 1,398 $ 2,000 $ 604 $ (536) $ (99) $ (788) $ (568) $ 4,168 $ (1,991)
Basic net income (loss) per common share $ 0.01 $ 0.05 $ 0.07 $ 0.02         $ 0.15 $ (0.07)
Weighted average common shares used in computing basic net income (loss) per common share                 28,579,000 27,333,000
Effect of dilutive common equivalents outstanding                 1,784,000  
Weighted average common shares used in computing diluted net income (loss) per common share                 30,363,000 27,333,000
Diluted net income (loss) per common share $ 0.01 $ 0.05 $ 0.07 $ 0.02         $ 0.14 $ (0.07)
Stock Options                    
Net Income (Loss) Per Common Share                    
Antidilutive securities excluded from computation of earnings per share, share amount                 256,538 3,133,960