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
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 57,899   $ 58,332
Total, net of cash received 1,279 $ 3,592  
Solar Photovoltaic Projects And EEX      
Business Acquisition [Line Items]      
Accounts receivable 150   1,015
Prepaid expenses and other current assets 2   12
Property and equipment and energy assets 315   0
Intangibles 500   680
Goodwill 315   2,845
Accounts payable (32)   (67)
Billings in excess of cost and estimated earnings (62)   0
Purchase price 1,188   4,485
Total, net of cash received 1,188   4,485
Debt assumed 0   0
Total fair value of consideration $ 1,188   $ 4,485