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Commitments (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2018
Jan. 31, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 22, 2018
Dec. 31, 2012
Disclosure of contingent liabilities in business combination [line items]              
Lease Expire dates     2020        
EnerNOC [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Term of agreement   5 years          
Air Products and Chemicals [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Term of agreement   15 years          
Remaining term of agreement   6 years          
ECOM LTDA [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Termination period of agreement February 2019            
ECOM LTDA [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Termination period of agreement February 2020            
ECOM LTDA [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Termination period of agreement February 2019            
Primental Technologies [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Termination period of agreement     16 months        
Percentage of advance payment     20.00%        
USD [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Rental expenses relating to operating leases     $ 700 $ 500 $ 1,100    
Consideration of sales and used tax             $ 2,452,028
Interest on sales and used tax             $ 394,138
USD [Member] | EnerNOC [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Annual consideration     2,800 $ 1,000 $ 1,000    
USD [Member] | Air Products and Chemicals [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Commitments to purchase equipment   $ 30,000          
Initial payment   1,200          
Monthly payment   400          
Remaining amount under agreement   $ 28,800          
USD [Member] | ECOM LTDA [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Obligation under agreements $ 6,100            
USD [Member] | ECOM LTDA [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Obligation under agreements 6,300            
USD [Member] | ECOM LTDA [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Obligation under agreements $ 5,200            
USD [Member] | Primental Technologies [Member]              
Disclosure of contingent liabilities in business combination [line items]              
Obligation under agreements           $ 1,670  
Estimated project cost     $ 23,200