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Description of Business, Basis of Presentation, and Operating Segment - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
Segment
Segment Reporting Information [Line Items]  
Number of reportable operating segment 1us-gaap_NumberOfReportableSegments
Spectrum Pharma Canada [Member]  
Segment Reporting Information [Line Items]  
Ownership interest, percentage 50.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sppi_CanadianAffiliatedEntityMember
Cancer Drugs [Member]  
Segment Reporting Information [Line Items]  
Number of products for sale 5sppi_NumberofProductsforSale
/ us-gaap_ProductOrServiceAxis
= sppi_CancerDrugsMember