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Stock Options and Share-Based Compensation - Additional Information (Detail) - 2017 Plan - Restricted Stock Units (RSUs) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted (in shares) 83,816        
Vesting period       3 years  
Stock-based compensation expense   $ 141 $ 41 $ 200 $ 82
Remaining estimated compensation expense   $ 990   $ 990