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Accrued liabilities (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Payables and Accruals [Abstract]    
Accrued accounting fee $ 85,000 $ 71,000
Accrued legal-related fees 0 26,000
Accrued program liabilities 736,000 0
Accrued product-related fees 295,000 0
Customer overpayment 0 43,000
Other accrued liabilities 32,000 46,000
Total accrued liabilities $ 1,148,000 $ 186,000