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           Inventory, net (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Sep. 30, 2014 
         | 
        
           Dec. 31, 2013 
         | 
      
|---|---|---|
| Inventory, net | ||
| Raw materials | $ 11,978 | $ 12,358 | 
| Finished goods | 23,375 | 15,723 | 
| Allowance for obsolescence | (11,003) | (14,218) | 
| Total inventory, net | $ 24,350 | $ 13,863 | 
| X | ||||||||||
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- Definition 
          Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Definition 
          Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
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- Details 
          
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| X | ||||||||||
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- Definition 
          Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
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- Definition 
          Amount of valuation reserve for inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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