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Share-Based Compensation - Schedule of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Unvested, Beginning Balance 736,891 1,172,493 1,006,206
Number of Shares, Granted 738,998 495,087 718,959
Number of Shares, Vested (448,726) (585,755) (455,303)
Number of Shares, Forfeited (51,748) (344,934) (97,369)
Number of Shares, Unvested, Ending Balance 975,415 736,891 1,172,493
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance $ 3.35 $ 4.43 $ 6.22
Weighted-Average Grant Date Fair Value, Granted 1.55 2.43 3.2
Weighted-Average Grant Date Fair Value, Vested 3.82 4.58 6.13
Weighted-Average Grant Date Fair Value, Forfeited 2.21 4.05 2.97
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance $ 1.83 $ 3.35 $ 4.43