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Related Party Arrangements (Details) (Chief Executive Officer, Research Grants, USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Chief Executive Officer | Research Grants
   
Related Party Transaction [Line Items]    
Total expense $ 350,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember
$ 297,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember