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Share-Based Compensation - Schedule of Restricted Share Activity (Detail) - Restricted Stock [Member]
 9 Months Ended
Jun. 30, 2024
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Unvested, Beginning Balance | shares 736,891
Number of Shares, Granted | shares 438,227
Number of Shares, Vested | shares (420,438)
Number of Shares, Forfeited | shares (51,747)
Number of Shares, Unvested, Ending Balance | shares 702,933
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 3.35
Weighted-Average Grant Date Fair Value, Granted | $ / shares 1.53
Weighted-Average Grant Date Fair Value, Vested | $ / shares 3.82
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 1.25
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 2.02