Annual report pursuant to Section 13 and 15(d)

Project Assets - Additional Information (Details)

v3.6.0.2
Project Assets - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Project assets, net $ 319,758,000 $ 244,309,000  
Capital lease assets 15,640,000 6,810,000  
Less - accumulated depreciation and amortization (744,000) (174,000)  
Capital lease assets, net 14,896,000 6,636,000  
Proceeds from Section 1603 grants 0 0 $ 3,727,000
Deferred grant income 7,739,000 8,291,000  
Rebates from utility company 0 0  
Project asset depreciation 19,377,000 16,911,000 15,047,000
Depreciation and amortization expense on capital lease assets 570,000 174,000 $ 0
Renewal Energy Program      
Property, Plant and Equipment [Line Items]      
Project assets 431,361,000 336,065,000  
Less - accumulated depreciation and amortization (111,603,000) (91,756,000)  
Project assets, net $ 319,758,000 $ 244,309,000