Quarterly report pursuant to Section 13 or 15(d)

VIE Arrangements - Carrying Amounts and Classification of the VIEs' Assets and Liabilities Included in the Consolidated Balance Sheets (Details)

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VIE Arrangements - Carrying Amounts and Classification of the VIEs' Assets and Liabilities Included in the Consolidated Balance Sheets (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
InvestmentFund
fund
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Current assets:        
Cash $ 299,537 $ 215,706 $ 226,625 $ 202,525
Restricted cash 54,182   77,626  
Accounts receivable, net 77,846   66,435  
Prepaid expenses and other current assets 8,692   8,563  
Total current assets 530,086   461,413  
Solar energy systems, net 4,149,883   3,820,017  
Other assets 380,919   335,685  
Total assets [1] 5,207,380   4,749,787  
Current liabilities:        
Accounts payable 153,206   131,278  
Distributions payable to noncontrolling interests and redeemable noncontrolling interests 16,444   15,847  
Accrued expenses and other liabilities 104,328   98,636  
Deferred revenue, current portion 59,818   47,407  
Deferred grants, current portion 8,029   7,885  
Non-recourse debt, current portion 35,158   35,484  
Total current liabilities 637,890   372,191  
Deferred revenue, net of current portion 643,613   544,218  
Deferred grants, net of current portion 217,013   221,739  
Non-recourse debt, net of current portion 1,688,989   1,466,438  
Other liabilities 113,992   48,210  
Total liabilities [1] $ 3,719,754   3,340,703  
Number of pass-through Fund arrangements | InvestmentFund 3      
Payments to acquire interest in VIEs $ (4,600) $ 0    
Acquisition of Variable Interest Entity 4,989      
Additional Paid-In Capital        
Current liabilities:        
Acquisition of Variable Interest Entity (1,077)      
Variable Interest Entities        
Current assets:        
Cash 167,194   105,494  
Restricted cash 681   2,071  
Accounts receivable, net 19,762   18,539  
Prepaid expenses and other current assets 387   387  
Total current assets 188,024   126,491  
Solar energy systems, net 2,901,211   2,712,377  
Other assets 74,600   66,427  
Total assets 3,163,835   2,905,295  
Current liabilities:        
Accounts payable 8,512   12,136  
Distributions payable to noncontrolling interests and redeemable noncontrolling interests 16,257   15,797  
Accrued expenses and other liabilities 7,742   7,122  
Deferred revenue, current portion 34,508   29,102  
Deferred grants, current portion 1,014   982  
Non-recourse debt, current portion 4,440   4,217  
Total current liabilities 72,473   69,356  
Deferred revenue, net of current portion 409,633   367,818  
Deferred grants, net of current portion 27,665   28,247  
Non-recourse debt, net of current portion 183,648   186,494  
Other liabilities 17,493   8,843  
Total liabilities $ 710,912   $ 660,758  
Number of pass-through Fund arrangements | fund 6      
Payments to acquire interest in VIEs $ (4,600)      
Variable Interest Entities | Additional Paid-In Capital        
Current liabilities:        
Acquisition of Variable Interest Entity $ 1,100      
[1]
The Company’s consolidated assets as of June 30, 2019 and December 31, 2018 include $3,163,835 and $2,905,295, respectively, in assets of variable interest entities (“VIEs”) that can only be used to settle obligations of the VIEs. These assets include solar energy systems, net, as of June 30, 2019 and December 31, 2018 of $2,901,211 and $2,712,377, respectively; cash as of June 30, 2019 and December 31, 2018 of $167,194 and $105,494, respectively; restricted cash as of June 30, 2019 and December 31, 2018 of $681 and $2,071, respectively; accounts receivable, net as of June 30, 2019 and December 31, 2018 of $19,762 and $18,539, respectively; prepaid expenses and other current assets as of June 30, 2019 and December 31, 2018 of $387 and $387, respectively; and other assets as of June 30, 2019 and December 31, 2018 of $74,600 and $66,427, respectively. The Company’s consolidated liabilities as of June 30, 2019 and December 31, 2018 include $710,912 and $660,758, respectively, in liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include accounts payable as of June 30, 2019 and December 31, 2018 of $8,512 and $12,136, respectively; distributions payable to noncontrolling interests and redeemable noncontrolling interests as of June 30, 2019 and December 31, 2018 of $16,257 and $15,797, respectively; accrued expenses and other current liabilities as of June 30, 2019 and December 31, 2018 of $7,742 and $7,122, respectively; deferred revenue as of June 30, 2019 and December 31, 2018 of $444,141 and $396,920, respectively; deferred grants as of June 30, 2019 and December 31, 2018 of $28,679 and $29,229, respectively; non-recourse debt as of June 30, 2019 and December 31, 2018 of $188,088 and $190,711, respectively; and other liabilities as of June 30, 2019 and December 31, 2018 of $17,493 and $8,843, respectively.