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Derivative Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Series C preferred embedded derivative [Member]    
Derivatives, Fair Value [Line Items]    
Embedded derivative, fair value $ 10,921us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 $ 13,804us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Warrant derivative [Member]    
Derivatives, Fair Value [Line Items]    
Embedded derivative, fair value 4,593us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= sppr_WarrantDerivativeMember		 6,533us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= sppr_WarrantDerivativeMember
Derivative liabilities at fair value 2012 [member]    
Derivatives, Fair Value [Line Items]    
Embedded derivative, fair value $ 15,514us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= sppr_DerivativeLiabilitiesAtFairValue2012Member		 $ 20,337us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= sppr_DerivativeLiabilitiesAtFairValue2012Member