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STOCK-BASED COMPENSATION - Stock Option Activity (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Options  
Beginning balance (in shares) | shares 2,392
Granted (in shares) | shares 708
Exercised (in shares) | shares (15)
Canceled (in shares) | shares (191)
Ending balance (in shares) | shares 2,894
Exercisable options (in shares) | shares 1,636
Expected to vest (in shares) | shares 1,257
Weighted-Average Exercise Price  
Beginning balance (in dollars per share) | $ / shares $ 8.35
Granted (in dollars per share) | $ / shares 3.33
Exercised (in dollars per share) | $ / shares 2.07
Canceled (in dollars per share) | $ / shares 11.50
Ending balance (in dollars per share) | $ / shares 6.95
Exercisable (in dollars per share) | $ / shares 10.03
Expected to vest (in dollars per share) | $ / shares $ 2.93
Weighted-Average Remaining Contractual Life  
Outstanding weighted average remaining contractual life (in years) 7 years 18 days
Exercisable weighted average remaining contractual life (in years) 5 years 5 months 26 days
Expected to vest weighted average remaining contractual life (in years) 9 years 29 days
Aggregate Intrinsic Value  
Aggregate intrinsic value outstanding | $ $ 5
Aggregate intrinsic value exercisable | $ 5
Aggregate intrinsic value expected to vest | $ $ 0