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Mundipharma Agreement - Additional Information (Detail) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 29, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Company determined development payment $ 60,279,000us-gaap_CostsAndExpenses $ 64,538,000us-gaap_CostsAndExpenses  
Mundipharma [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Company determined development payment     7,000,000us-gaap_CostsAndExpenses
/ us-gaap_CounterpartyNameAxis
= sppi_MundipharmaMember
Maximum [Member] | Regulatory [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Potential milestone payments 16,000,000sppi_PotentialMilestonePayments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= sppi_RegulatoryMember		    
Maximum [Member] | Commercial progress and sales-dependent [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Potential milestone payments $ 107,000,000sppi_PotentialMilestonePayments
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= sppi_CommercialProgressAndSalesDependentMember