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Intangible Assets, Net (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Intangible assets    
Amortization of finite lived intangible assets $ 186,819us-gaap_AmortizationOfIntangibleAssets  
In-process research and development costs (IPR&D)    
Intangible assets    
Gross carrying amount 6,449,628us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
6,449,628us-gaap_IntangibleAssetsGrossExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
Intangible assets, net $ 6,449,628us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
$ 6,449,628us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember