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Net Loss Per Share - Schedule of Securities Excluded from Calculation of Net Loss Per Share (Detail)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive excluded from computation of earnings per share amount (shares) 14,867,194us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 15,299,594us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Preferred stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive excluded from computation of earnings per share amount (shares) 40,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 40,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
Common stock warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive excluded from computation of earnings per share amount (shares) 71,227us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= sppi_CommonStockWarrantMember		 145,855us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= sppi_CommonStockWarrantMember
2018 Convertible Notes [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive excluded from computation of earnings per share amount (shares) 11,401,284us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sppi_TwoThousandEighteenConvertibleNotesMember		 11,401,284us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sppi_TwoThousandEighteenConvertibleNotesMember
Common stock options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive excluded from computation of earnings per share amount (shares) 1,825,868us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sppi_CommonStockOptionsMember		 2,530,867us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sppi_CommonStockOptionsMember
Restricted stock awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive excluded from computation of earnings per share amount (shares) 1,528,815us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sppi_RestrictedStockAwardsMember		 1,181,588us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sppi_RestrictedStockAwardsMember