Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity - Schedule of equity awards (Detail)

v3.22.1
Stockholders' equity - Schedule of equity awards (Detail) - Employee stock option - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Options,Outstanding, beginning of period   702,064 702,064  
Stock Options, Granted     36,000  
Stock Options, Outstanding, end of period 738,064 702,064 738,064 702,064
Stock Options, Exercisable, end of period 247,560   247,560  
Exercise price, beginning of period   $ 7.16 $ 7.16  
Weighted-average Exercise Price, Granted     2.99  
Weighted-average Exercise Price, Exercise price, end of period $ 6.95 $ 7.16 6.95 $ 7.16
Weighted-average Exercise Price, Exercisable, end of period $ 13.81   $ 13.81  
Weighted-average Remaining Contractual Term, Outstanding   7 years 9 months 25 days 7 years 4 months 20 days 8 years 25 days
Weighted-average Remaining Contractual Term, Granted     9 years 11 months 4 days  
Weighted-average Remaining Contractual Term, Exercisable 6 years 10 months 28 days