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Supplemental Cash Flow Information - Summary of Additional Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental disclosures of cash flow information:      
Cash paid for interest $ 0us-gaap_InterestPaid $ 0us-gaap_InterestPaid $ 1,885us-gaap_InterestPaid
Cash paid for income taxes 0us-gaap_IncomeTaxesPaid 0us-gaap_IncomeTaxesPaid 0us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:      
Subscription receivable 0us-gaap_StockholdersEquityNoteSubscriptionsReceivable 0us-gaap_StockholdersEquityNoteSubscriptionsReceivable 2,004us-gaap_StockholdersEquityNoteSubscriptionsReceivable
Conversion of note payable 0us-gaap_DebtConversionConvertedInstrumentAmount1 0us-gaap_DebtConversionConvertedInstrumentAmount1 2,385us-gaap_DebtConversionConvertedInstrumentAmount1
Issuance of additional warrants 0fcsc_IssuanceOfAdditionalWarrants 0fcsc_IssuanceOfAdditionalWarrants 11,077fcsc_IssuanceOfAdditionalWarrants
Conversion of preferred stock derivative balance into common stock 0fcsc_ConversionOfPreferredStockDerivativeBalanceIntoCommonStock 0fcsc_ConversionOfPreferredStockDerivativeBalanceIntoCommonStock 1,350fcsc_ConversionOfPreferredStockDerivativeBalanceIntoCommonStock
Cashless exercise of warrants previously recorded as a liability 0fcsc_ExerciseOfWarrantsCashless 298fcsc_ExerciseOfWarrantsCashless 17fcsc_ExerciseOfWarrantsCashless
Warrant liability reclassified to equity 0fcsc_WarrantLiabilityReclassifiedToEquity 0fcsc_WarrantLiabilityReclassifiedToEquity 15,048fcsc_WarrantLiabilityReclassifiedToEquity
Accrued derivative liability $ 0us-gaap_DerivativeLiabilities $ 0us-gaap_DerivativeLiabilities $ 793us-gaap_DerivativeLiabilities