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Investments - Summary of Investments by Type of Security (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items]    
Cost $ 32,003 $ 70,314
Gross Unrealized Gains 0 0
Gross Unrealized Losses (525) (1,413)
Short-term investments: 26,711 58,268
Long-term investments: 4,767 10,633
Fair Market Value 31,478 68,901
U.S. Treasury    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term 4,004 6,016
Amortized cost, long-term 3,409 3,431
Gross Unrealized Gains, short-term 0 0
Gross Unrealized Gains, long-term 0 0
Gross Unrealized Losses, short-term (48) (134)
Gross Unrealized Losses, long-term (158) (210)
Short-term investments: 3,956 5,882
Long-term investments: 3,251 3,221
Commercial paper    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term 6,185 18,245
Gross Unrealized Gains, short-term 0 0
Gross Unrealized Losses, short-term (101) (223)
Short-term investments: 6,084 18,022
Corporate debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term 16,812 32,065
Amortized cost, long-term 1,593 7,692
Gross Unrealized Gains, short-term 0 0
Gross Unrealized Gains, long-term 0 0
Gross Unrealized Losses, short-term (141) (528)
Gross Unrealized Losses, long-term (77) (280)
Short-term investments: 16,671 31,537
Long-term investments: $ 1,516 7,412
Foreign government and agency securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term   2,865
Gross Unrealized Gains, short-term   0
Gross Unrealized Losses, short-term   (38)
Short-term investments:   $ 2,827