Annual report pursuant to Section 13 and 15(d)

Contingencies and commitments - Lease Expenses (Details)

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Contingencies and commitments - Lease Expenses (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
Contingencies and commitments        
Lease expenses $ 841 $ 3,617 $ 2,255 $ 610