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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets        
Cash and cash equivalents $ 37,495us-gaap_CashAndCashEquivalentsAtCarryingValue $ 60,033us-gaap_CashAndCashEquivalentsAtCarryingValue $ 31,346us-gaap_CashAndCashEquivalentsAtCarryingValue $ 10,799us-gaap_CashAndCashEquivalentsAtCarryingValue
Liabilities        
Warrant liability 11,286fcsc_WarrantLiabilitiesFairValueDisclosure 15,216fcsc_WarrantLiabilitiesFairValueDisclosure    
Quoted prices in active markets (Level 1)        
Assets        
Cash and cash equivalents 37,495us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 60,033us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Significant unobservable inputs (Level 3)        
Liabilities        
Warrant liability $ 11,286fcsc_WarrantLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 15,216fcsc_WarrantLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member