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Discontinued operation (Details) - USD ($)
$ in Thousands
Jan. 18, 2012
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2015
BH Holdings, S.A.S [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Assets   $ 0 $ 0  
Disposal Group, Including Discontinued Operation, Other Liabilities, Current   93 93 $ 86
Disposal Group, Including Discontinued Operation, Liabilities   93 93  
Assets (Liabilities) of Disposal Group, Including Discontinued Operation, Net   $ (93) $ (93)  
BH Holdings, S.A.S [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Bankruptcy Proceedings, Operating Period During Liquidation 3 months