v3.22.4
Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - Estimate of Fair Value Measurement - USD ($)
$ in Thousands
Dec. 31, 2022
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis $ 89,262 $ 88,210
Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 52,768 23,439
Notes receivable    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 36,494 35,872
Corporate bonds, municipal bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis   28,899
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 52,768 52,338
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 52,768 23,439
Quoted Prices in Active Markets for Identical Assets (Level 1) | Notes receivable    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds, municipal bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis   28,899
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 0 0
Significant Other Observable Inputs (Level 2) | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 0 0
Significant Other Observable Inputs (Level 2) | Notes receivable    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 0 0
Significant Other Observable Inputs (Level 2) | Corporate bonds, municipal bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis   0
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 36,494 35,872
Significant Unobservable Inputs (Level 3) | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis 0 0
Significant Unobservable Inputs (Level 3) | Notes receivable    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis $ 36,494 35,872
Significant Unobservable Inputs (Level 3) | Corporate bonds, municipal bonds and other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets at fair value on a recurring basis   $ 0