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Supplemental Balance Sheet Disclosures - Inventories and Prepaid expenses and other current assets (Details) - USD ($)
Dec. 31, 2019
Sep. 30, 2019
Inventory valuation    
Raw materials $ 3,527,323 $ 3,408,742
Work-in-process 856,314 775,770
Finished goods 288,826 286,182
Inventories 4,672,463 4,470,694
Prepaid expenses and other current assets    
Prepaid insurance 449,398 302,376
Other 237,216 339,673
Total prepaid expenses and other current assets $ 686,614 $ 642,049