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Income Taxes - Schedule of Deferred Income Taxes, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]    
Depreciable assets $ (3,802) $ (3,995)
Deferred revenue 1,082 2,103
Accruals and reserves 2,052 1,615
Stock-based compensation 2,665 2,443
Impaired strategic investments 1,829 1,787
NOL carryforwards 4,578 6,379
U.S. Federal and state R&D credits 2,973 4,465
Capitalized R&D expenses 7,976  
Other 648 848
Valuation allowance (22,005) (17,672)
Deferred taxes liabilities, net $ (2,004) $ (2,027)