Annual report pursuant to Section 13 and 15(d)

Project Assets - Additional Information (Details)

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Project Assets - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Project assets, net $ 244,309,000 $ 217,772,000  
Proceeds from Section 1603 grants 0 3,727,000 $ 3,262,000
Deferred grant income 8,291,000 8,842,000  
Rebates from utility company 0 0  
Project asset depreciation 16,911,000 15,047,000 $ 12,595,000
Renewal Energy Program      
Property, Plant and Equipment [Line Items]      
Project assets 336,065,000 292,879,000  
Less - accumulated depreciation and amortization (91,756,000) (75,107,000)  
Project assets, net $ 244,309,000 $ 217,772,000