Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment, net - Deprecation Expense (Details)

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Property, Plant and Equipment, net - Deprecation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Total $ 21,511 $ 9,447 $ 7,179
Cost of sales      
Property, Plant and Equipment [Line Items]      
Total 10,855 2,957 2,820
Sales and marketing expenses      
Property, Plant and Equipment [Line Items]      
Total 1,793 893 471
Product development      
Property, Plant and Equipment [Line Items]      
Total 2,186 1,443 858
General and administrative      
Property, Plant and Equipment [Line Items]      
Total $ 6,677 $ 4,154 $ 3,030