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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Schedule of Revenue from External Customers Revenue from external customers (including, but not limited to homeowners) for each group of similar products and services is as follows (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Customer agreements$194,924 $102,213 $549,689 $294,991 
Incentives36,945 12,272 76,250 24,713 
Customer agreements and incentives231,869 114,485 625,939 319,704 
Solar energy systems127,936 52,238 307,408 168,094 
Products78,960 43,037 241,378 113,987 
Solar energy systems and product sales206,896 95,275 548,786 282,081 
Total revenue$438,765 $209,760 $1,174,725 $601,785 
Cash and Restricted Cash Cash and restricted cash consists of the following (in thousands):
Nine Months Ended September 30,
  20212020
Beginning of period:
   Cash $519,965 $269,577 
   Restricted cash, current and long-term188,243 93,652 
Total$708,208 $363,229 
End of period:
   Cash $717,593 $276,052 
   Restricted cash, current and long-term223,528 105,462 
Total$941,121 $381,514 
Cash and Restricted Cash Cash and restricted cash consists of the following (in thousands):
Nine Months Ended September 30,
  20212020
Beginning of period:
   Cash $519,965 $269,577 
   Restricted cash, current and long-term188,243 93,652 
Total$708,208 $363,229 
End of period:
   Cash $717,593 $276,052 
   Restricted cash, current and long-term223,528 105,462 
Total$941,121 $381,514 
Accounts Receivable, Net Accounts receivable, net, consists of the following (in thousands):
  September 30, 2021 December 31, 2020
Customer receivables$182,160 $97,723 
Other receivables2,495 710 
Rebates receivable4,520 1,569 
Allowance for credit losses(11,349)(4,861)
Total$177,826 $95,141 
Deferred Revenue The opening balance of deferred revenue was $729.5 million as of December 31, 2019. Deferred revenue consists of the following (in thousands):
 September 30, 2021December 31, 2020
Under Customer Agreements:
Payments received, net$646,269 $614,906 
Financing component balance56,875 51,835 
703,144 666,741 
Under SREC contracts:
Payments received, net138,022 126,793 
Financing component balance7,352 5,742 
145,374 132,535 
Total$848,518 $799,276