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Accrued liabilities (Tables)
12 Months Ended
Jun. 30, 2019
Payables and Accruals [Abstract]  
Summary of Accrued liabilities
    June 30,  
    2019     2018  
Accrued accounting fee     85,000       71,000  
Accrued legal-related fees           26,000  
Accrued program liabilities     736,000        
Accrued product-related fees     295,000        
Customer overpayment           43,000  
Other accrued liabilities*     32,000       46,000  
Total accrued liabilities   $ 1,148,000     $ 186,000