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Share-Based Compensation - Schedule of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Unvested, Beginning Balance 975,415 736,891 1,172,493
Number of Shares, Granted 35,000 738,998 495,087
Number of Shares, Vested   (448,726) (585,755)
Number of Shares, Forfeited (3,000) (51,748) (344,934)
Number of Shares, Unvested, Ending Balance 1,007,415 975,415 736,891
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance $ 1.83 $ 3.35 $ 4.43
Weighted-Average Grant Date Fair Value, Granted 1.03 1.55 2.43
Weighted-Average Grant Date Fair Value, Vested   3.82 4.58
Weighted-Average Grant Date Fair Value, Forfeited 3.72 2.21 4.05
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance $ 1.79 $ 1.83 $ 3.35