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Long-term debt - Schedule Of Maturities Of Long Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Long-term debt    
Years ending September 30, 2022 $ 833  
Total amount of loan principal 833  
Years ending September 30, 2022 9  
Interest Payable On Long Term Debt 9  
Years ending September 30, 2022 842  
Total amount of principal and interest 842  
Less: Interest (9)  
Less unamortized debt discount (4)  
Add: accretion of final payment fee 723  
Long-term Debt, Current Maturities $ 1,552 $ 3,333