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Share-Based Compensation - Schedule of Restricted Share Activity (Detail) - Restricted Stock [Member]
 9 Months Ended
Jun. 30, 2025
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Unvested, Beginning Balance | shares 975,415
Number of Shares, Granted | shares 550,247
Number of Shares, Vested | shares (532,397)
Number of Shares, Forfeited | shares (29,575)
Number of Shares, Unvested, Ending Balance | shares 963,690
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares $ 1.83
Weighted-Average Grant Date Fair Value, Granted | $ / shares 1.04
Weighted-Average Grant Date Fair Value, Vested | $ / shares 1.92
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 1.88
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares $ 1.32