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INVESTMENTS - Summary of Investments by Type of Security (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items]    
Cost $ 43,838 $ 70,314
Gross Unrealized Gains 0 0
Gross Unrealized Losses (372) (1,413)
Short-term investments: 40,651 58,268
Long-term investments: 2,815 10,633
Fair Market Value 43,466 68,901
U.S. Treasury    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term 22,135 6,016
Amortized cost, long-term 1,375 3,431
Gross Unrealized Gains, short-term 0 0
Gross Unrealized Gains, long-term 0 0
Gross Unrealized Losses, short-term (96) (134)
Gross Unrealized Losses, long-term (79) (210)
Short-term investments: 22,039 5,882
Long-term investments: 1,296 3,221
Commercial paper    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term 6,200 18,245
Gross Unrealized Gains, short-term 0 0
Gross Unrealized Losses, short-term (45) (223)
Short-term investments: 6,155 18,022
Corporate debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost, short-term 12,534 32,065
Amortized cost, long-term 1,594 7,692
Gross Unrealized Gains, short-term 0 0
Gross Unrealized Gains, long-term 0 0
Gross Unrealized Losses, short-term (77) (528)
Gross Unrealized Losses, long-term (75) (280)
Short-term investments: 12,457 31,537
Long-term investments: $ 1,519 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