Annual report pursuant to Section 13 and 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
6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
Property, plant and equipment        
Depreciation expense $ 1,176 $ 5,032 $ 3,126 $ 705
Leasehold improvements        
Property, plant and equipment        
Loss on disposal   $ 194 $ 122