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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Contingencies and commitments        
Lease expenses $ 802 $ 327 $ 2,882 $ 1,159