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Accrued liabilities (Details) - USD ($)
Sep. 30, 2019
Jun. 30, 2019
Accrued Liabilities    
Accrued accounting fee $ 42,000 $ 85,000
Accrued program liabilities 843,000 736,000
Accrued product-related fees 133,000 295,000
Customer overpayment 79,000 0
Other accrued liabilities 54,000 32,000
Total accrued liabilities $ 1,151,181 $ 1,147,740