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Leases - Supplemental balance sheet information related to operating leases (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Oct. 01, 2019
Supplemental balance sheet information related to operating leases      
Operating lease right-of-use assets, net $ 776,665 $ 278,396 $ 300,000
Operating lease liabilities, current 155,532 94,516  
Operating lease liabilities, non-current 605,793 154,372  
Total operating lease liabilities $ 761,325 $ 248,888 $ 300,000