Quarterly report pursuant to Section 13 or 15(d)

Energy Assets - Narrative (Details)

v3.19.1
Energy Assets - Narrative (Details)
 3 Months Ended
May 03, 2019
USD ($)
project
Mar. 31, 2019
USD ($)
Agreement
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
project
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]            
Depreciation and amortization expense     $ 8,407,000   $ 6,312,000  
Finance lease right-of-use assets, amortization expense     532,000   534,000  
Number of projects acquired   3   3    
Number of projects under definitive agreement to acquire | Agreement   4        
Asset retirement obligation recorded in project assets   $ 886,000 886,000 $ 886,000    
Asset retirement obligation liability recorded in accrued expenses   908,000 908,000 908,000   $ 0
Depreciation of property and equipment     619,000   $ 542,000  
ARO accretion expense     9,000      
Solar Projects 2019            
Business Acquisition [Line Items]            
Fair value of consideration     2,529,000      
Contingent consideration, liability   $ 1,425,000 1,425,000 $ 1,425,000    
Amount paid to developers of projects     1,104,000      
ARO Asset            
Business Acquisition [Line Items]            
Depreciation of property and equipment     $ 11,000      
Scenario, Forecast | Solar Projects 2019            
Business Acquisition [Line Items]            
Number of projects under definitive agreement to acquire | project 4          
Fair value of consideration $ 4,556,000          
Contingent consideration, liability 4,783,000          
Amount paid to developers of projects $ 456,000