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Intangible assets other than goodwill - Schedule of Finite-Lived Intangible Assets (Details)

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Intangible assets other than goodwill - Schedule of Finite-Lived Intangible Assets (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 886,621 $ 450,365 $ 286,070
Finite-Lived Intangible Assets, Accumulated Amortization 102,591 (78,345) (44,449)
Intangible assets, net 784,030 372,020 241,621
Patents
      
Schedule of Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 355,961 214,883 67,902
Finite-Lived Intangible Assets, Accumulated Amortization 29,192 (20,547) (6,195)
Intangible assets, net   194,336 61,707
Product Certifications
      
Schedule of Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 290,660 235,482 218,168
Finite-Lived Intangible Assets, Accumulated Amortization 69,399 (57,798) (38,254)
Intangible assets, net   177,684 179,914
Developed Technology Rights [Member]
      
Schedule of Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross 240,000    
Finite-Lived Intangible Assets, Accumulated Amortization $ 4,000