Quarterly report pursuant to Section 13 or 15(d)

Property, plant and equipment, net - Depreciation Expense (Details)

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Property, plant and equipment, net - Depreciation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property, plant and equipment, net        
Depreciation expense $ 1,037 $ 804 $ 2,023 $ 1,512
Loss on disposal     $ (194)