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Supplemental Balance Sheet Disclosures - Inventories and Prepaid expenses and other current assets (Details) - USD ($)
Mar. 31, 2019
Sep. 30, 2018
Inventory valuation    
Raw materials $ 3,280,858 $ 2,892,366
Work-in-process 842,986 817,051
Finished goods 446,968 570,691
Inventories 4,570,812 4,280,108
Prepaid expenses and other current assets    
Prepaid insurance 320,407 258,015
Other 241,384 286,219
Total prepaid expenses and other current assets $ 561,791 $ 544,234