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Project Assets - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2015
MWh
Mar. 31, 2015
Dec. 31, 2014
Sep. 18, 2014
Schedule of Project Assets (Details) [Line Items]        
Project assets   $ 107,354,000sopw_ConstructionInProgressCurrent $ 73,930,000sopw_ConstructionInProgressCurrent  
Calwaii [Member]        
Schedule of Project Assets (Details) [Line Items]        
Deferred Revenue       5,850,000us-gaap_DeferredRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sopw_CalwaiiMember
Project asset cost held for development   28,646,000sopw_ProjectAssetsHeldForDevelopmentAndSale
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sopw_CalwaiiMember
23,943,000sopw_ProjectAssetsHeldForDevelopmentAndSale
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= sopw_CalwaiiMember
 
Mauka Makai FIT LLC [Member]        
Schedule of Project Assets (Details) [Line Items]        
Percentage of Membership Interest Acquired 100.00%sopw_PercentageOfMembershipInterestAcquired
/ us-gaap_BusinessAcquisitionAxis
= sopw_MaukaMakaiFitLlcMember
     
Payments to Acquire Productive Assets 4,179,000us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_BusinessAcquisitionAxis
= sopw_MaukaMakaiFitLlcMember
     
Power Generating Capacity (in Megawatt-hours) 4.2sopw_PowerGeneratingCapacity
/ us-gaap_BusinessAcquisitionAxis
= sopw_MaukaMakaiFitLlcMember
     
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   4,179,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= sopw_MaukaMakaiFitLlcMember
   
UNITED STATES        
Schedule of Project Assets (Details) [Line Items]        
Project assets   53,971,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_US
48,520,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_US
 
UNITED KINGDOM        
Schedule of Project Assets (Details) [Line Items]        
Project assets   44,912,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_GB
14,000,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_GB
 
JAPAN        
Schedule of Project Assets (Details) [Line Items]        
Project assets   14,872,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_JP
12,826,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_JP
 
CHINA        
Schedule of Project Assets (Details) [Line Items]        
Project assets   25,613,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_CN
19,849,000sopw_ConstructionInProgressCurrent
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Mountain Creek Project [Member]        
Schedule of Project Assets (Details) [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration     17,864,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
 
Disposal Group, Including Discontinued Operation, Revenue   0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
   
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)   0us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
   
Loss on Contracts     2,055,000us-gaap_LossOnContracts
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
 
Carrying amount of net of impairment   17,864,000us-gaap_AmountOfImpairmentToCarryingAmountOfRegulatoryAssets
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
17,864,000us-gaap_AmountOfImpairmentToCarryingAmountOfRegulatoryAssets
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
 
Impairment on project   $ 2,055,000us-gaap_ImpairmentOfOngoingProject
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember
$ 2,055,000us-gaap_ImpairmentOfOngoingProject
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= sopw_MountainCreekProjectMember