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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
Jun. 30, 2019
Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units granted (in shares) 36,534  
Vesting period   3 years
Stock-based compensation expense   $ 24
Remaining estimated compensation expense   $ 575