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Segment Information - Net Sales by Major Product and Services (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenue $ 16,200us-gaap_SalesRevenueGoodsNet $ 3,613us-gaap_SalesRevenueGoodsNet
Engineering, Procurement and Construction (EPC) [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenue 13,035us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_EngineeringProcurementAndConstructionEPCMember		 3,185us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_EngineeringProcurementAndConstructionEPCMember
Power Purchase Agreements (PPA) [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenue 2,999us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_PowerPurchaseAgreementsPPAMember		 302us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_PowerPurchaseAgreementsPPAMember
Operating and Maintenance (O&M) [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenue   126us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_OperatingandMaintenanceOMMember
Residential PhotoVoltaic Systems [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenue 161us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_ResidentialPhotoVoltaicSystemsMember		  
Other Services [Member]    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Revenue $ 5us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= sopw_OtherServicesMember