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Investments - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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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

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