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Stock Options and Share-Based Compensation - Additional Information (Detail) - 2017 Plan [Member] - Restricted Stock Units (RSUs) [Member] - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
Oct. 31, 2018
Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted 17,769    
Vesting period     3 years
Stock-based compensation expense   $ 46,000 $ 61,000
Remaining estimated compensation expense   $ 451,000 $ 451,000