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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The tables below set forth, by level, our financial assets that are accounted for at fair value for the respective periods. The table does not include assets and liabilities that are measured at historical cost or any basis other than fair value (in thousands):
Fair Value Measured at Reporting Date Using
September 30, 2023Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market funds$489,395 $— $— $489,395 
$489,395 $— $— $489,395 
Liabilities
Derivatives:
Embedded EPP derivatives$— $— $3,948 $3,948 
$— $— $3,948 $3,948 

 Fair Value Measured at Reporting Date Using
December 31, 2022Level 1Level 2Level 3Total
Assets
Cash equivalents:
Money market funds$291,903 $— $— $291,903 
$291,903 $— $— $291,903 
Liabilities
Derivatives:
Embedded EPP derivatives$— $— $5,895 $5,895 
$— $— $5,895 $5,895 
Schedule of Change in Level 3 Financial Liabilities The changes in the Level 3 financial liabilities during the nine months ended September 30, 2023 were as follows (in thousands):
Embedded EPP Derivative Liability
Liabilities at December 31, 2022
$5,895 
EPP liability settlement(3,160)
Changes in fair value1,213 
Liabilities at September 30, 2023
$3,948 
Schedule of Fair Values and Carrying Values of Customer Receivables and Debt Instruments The following table presents the estimated fair values and carrying values of debt instruments (in thousands):
 September 30, 2023December 31, 2022
 Net Carrying
Value		Fair ValueNet Carrying
Value		Fair Value
   
Debt instruments
Recourse:
3% Green Convertible Senior Notes due June 2028
$614,183 613,298 $— — 
2.5% Green Convertible Senior Notes due August 2025
226,309 249,665 224,832 309,488 
10.25% Senior Secured Notes due March 2027
— — 60,960 60,472 
Non-recourse:
3.04% Senior Secured Notes due June 2031
— — 125,787 117,028 
4.6% Term Loan due March 2026
$1,483 1,345 $— —