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Commitments - Future minimum lease payments (Table) (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]  
Total $ 804
Within one year  
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]  
Total 165
After one year but not more than five years  
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]  
Total 567
More than five years  
Disclosure Of Maturity Analysis Of Operating Lease Payments [Line Items]  
Total $ 72