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Restricted Cash - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]    
Deposits Assets, Current 30,999us-gaap_DepositsAssetsCurrent $ 337us-gaap_DepositsAssetsCurrent
Solar Tax Partners 1, LLC [Member] | Guarantee Deposit [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Deposits Assets, Current 30,919us-gaap_DepositsAssetsCurrent
/ us-gaap_CounterpartyNameAxis
= sopw_SolarTaxPartners1LLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= sopw_GuaranteeDepositMember		  
Solar Tax Partners 1, LLC [Member] | Reserve [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Deposits Assets, Current 80us-gaap_DepositsAssetsCurrent
/ us-gaap_CounterpartyNameAxis
= sopw_SolarTaxPartners1LLCMember
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= sopw_ReserveMember		  
Minimum [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Maturity period of guarantee deposit 1 month  
Maximum [Member]    
Restricted Cash and Cash Equivalents Items [Line Items]    
Maturity period of guarantee deposit 6 months