Contingent Obligations and Non-Current Liabilities - Schedule of Government Grant Obligations Reflected in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Contingent Obligations and NonCurrent Liabilities Disclosure [Abstract]
Current liabilities	$ 735	$ 600
Non-current liabilities	$ 10,512	$ 10,524

xxx_Contingent Obligations and Non-Current Liabilities Disclosure [Abstract].

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