Quarterly report pursuant to Section 13 or 15(d)

Contingencies and commitments - Lease Expenses (Details)

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Contingencies and commitments - Lease Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Contingencies and commitments        
Lease expenses $ 1,053 $ 406 $ 2,080 $ 831