Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Related Transactions - Consideration Paid and the Allocation of the Purchase Price (Details)

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Business Acquisitions and Related Transactions - Consideration Paid and the Allocation of the Purchase Price (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]      
Total, net of cash received $ 21,343 $ 2,409  
Solar Photovoltaic Projects And EEX      
Business Acquisition [Line Items]      
Prepaid expenses and other current assets     $ 256
Property and equipment and energy assets     7,788
Purchase price     8,044
Total, net of cash received     8,044
Debt assumed     5,635
Total fair value of consideration     $ 2,409