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Fair Value Measurements - Fair Value by Major Security Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Unrealized Loss $ 0  
Short-term Securities 120 $ 7,945
Long-term Securities 0 249
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 173 8,639
Gross Unrealized Gain 0 8
Gross Unrealized Loss 0 0
Fair Value 173 8,647
Cash Equivalents 53 453
Short-term Securities 120 7,945
Long-term Securities 0 249
Fair Value, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 53 301
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair Value 53 301
Cash Equivalents 53 301
Short-term Securities 0 0
Long-term Securities 0 0
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 120 8,338
Gross Unrealized Gain 0 8
Gross Unrealized Loss 0 0
Fair Value 120 8,346
Cash Equivalents 0 152
Short-term Securities 120 7,945
Long-term Securities 0 249
Fair Value, Recurring [Member] | Level 2 [Member] | Certificates of Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis   401
Gross Unrealized Gain   0
Gross Unrealized Loss   0
Fair Value   401
Cash Equivalents   152
Short-term Securities   0
Long-term Securities   249
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Government Agency Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis   2,591
Gross Unrealized Gain   3
Gross Unrealized Loss   0
Fair Value   2,594
Cash Equivalents   0
Short-term Securities   2,594
Long-term Securities   0
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis 120 2,127
Gross Unrealized Gain 0 2
Gross Unrealized Loss 0 0
Fair Value 120 2,129
Cash Equivalents 0 0
Short-term Securities 120 2,129
Long-term Securities $ 0 0
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost Basis   3,219
Gross Unrealized Gain   3
Gross Unrealized Loss   0
Fair Value   3,222
Cash Equivalents   0
Short-term Securities   3,222
Long-term Securities   $ 0