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 ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipment      
Depreciation expense $ 7,188,000 $ 5,032,000 $ 3,126,000
Leasehold improvements      
Property, plant and equipment      
Loss on disposal $ 7,000 $ 194,000 $ 122,000