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Income Taxes (Tables)
 12 Months Ended
Sep. 30, 2025
Income Tax Disclosure [Abstract]  
Summary of Domestic and Foreign Components of Pre-Tax Loss
The domestic and foreign components of pre-tax loss for the years ended September 30, 2025, 2024, and 2023 are as follows:
Year ended September 30,
(in thousands)202520242023
US$(78,490)$(209,545)$(205,389)
Foreign1,539 1,379 1,923 
Total$(76,951)$(208,166)$(203,466)
Summary of Components of the Provision for Income Taxes
The components of the income tax expense for the years ended September 30, 2025, 2024, and 2023 are as follows:
Year ended September 30,
(in thousands)202520242023
Current
Federal$— $— $— 
State27 20 9 
Foreign692 540 1,143 
Total current$719 $560 $1,152 
Deferred
Federal$— $— $— 
State— — — 
Foreign— — — 
Total deferred$— $— $— 
Total provision (benefit) $719 $560 $1,152 
Summary of Effective Income Tax Rate Reconciliation
The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended September 30, 2025, 2024, and 2023:
Year ended
September 30,
202520242023
Tax expense computed at the federal statutory rate21 %21 %21 %
Change in valuation allowance(22)%(22)%(25)%
Research and development credit benefit7 %3 %5 %
Section 162(m) limitation on compensation(9)%(1)%— %
Stock-based compensation1 %(1)%(1)%
Change in fair value of contingent consideration and holdbacks — %— %1 %
Gain on sale of intangible assets 1 %— %— %
Others— %— %(2)%
Total income tax expense(1)%— %(1)%
Summary of Deferred Tax Assets and Liabilities
The significant components of the Company’s deferred tax assets and liabilities are as follows for the years ended September 30, 2025, and 2024:
September 30,
(in thousands)20252024
Net operating loss carryforwards$232,380 $226,959 
Research and development credit carryforwards67,626 59,578 
Capitalized research and development 54,438 43,232 
Operating lease liability18,657 21,377 
Stock-based compensation 13,359 13,384 
Other12,333 14,310 
Gross deferred tax assets$398,793 $378,840 
Less: Valuation allowance(383,378)(360,594)
Net deferred tax assets$15,415 $18,246 
Operating lease right-of-use asset$(12,174)$(14,786)
Intangible assets(3,241)(3,460)
Gross deferred tax liabilities$(15,415)$(18,246)
Total net deferred tax asset$— $— 
Summary of Unrecognized Tax Benefits Roll Forward
The aggregate changes in the balance of gross unrecognized tax benefits are as follows:
Federal and state
September 30,
(in thousands)202520242023
Unrecognized tax benefits at beginning of year$22,412 $19,185 $13,383 
Increase related to tax positions taken during year 2,617 3,354 5,043 
Increase/(decrease) related to tax positions taken in the prior year259 (127)759 
Unrecognized tax benefits at end of year$25,288 $22,412 $19,185