Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 2,174 $ 1,698 $ 4,207 $ 3,333
Cost of sales        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 670 911 1,337 1,631
Sales and marketing expenses        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 251 114 403 237
Product development        
Property, Plant and Equipment [Line Items]        
Total depreciation expense 326 153 669 323
General and administrative        
Property, Plant and Equipment [Line Items]        
Total depreciation expense $ 927 $ 520 $ 1,798 $ 1,142