Fair Value (Tables)

12 Months Ended

Dec. 31, 2022

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
December 31, 2022	Level 1		Level 2		Level 3		Total
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

	Fair Value Measured at Reporting Date Using
December 31, 2021	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market funds	$	297,034	$	—	$	—	$	297,034
	$	297,034	$	—	$	—	$	297,034
Liabilities
Derivatives:
Option to acquire a variable number of shares of Class A Common Stock	$	—	$	13,200	$	—	$	13,200
Embedded EPP derivatives	—		—		6,461		$	6,461
	$	—	$	13,200	$	6,461	$	19,661

Schedule of Natural Gas Forward Contracts

The following table provides the number and fair value of our natural gas fixed price forward contracts (in thousands):

	December 31, 2022			December 31, 2021
	Number of Contracts (MMBTU)²	Fair Value		Number of Contracts (MMBTU)²	Fair Value
Liabilities¹:
Natural gas fixed price forward contracts (not under hedging relationships)	—	$	—	88	$	—
¹ Recorded in current liabilities and derivative liabilities in the consolidated balance sheets.
² One MMBTU is a traditional unit of energy used to describe the heat value (energy content) of fuels.

Schedule of Change in Level 3 Financial Liabilities

For the years ended December 31, 2022, 2021 and 2020 we recorded the fair value of the embedded EPP derivatives with no material unrealized gains or losses recorded in either of the three years ended December 31, 2022, 2021 and 2020 in our consolidated statements of operations.

	Natural Gas Fixed Price Forward Contracts		Embedded EPP Derivative Liability		Total
Liabilities at December 31, 2020	$	2,574	$	5,542	$	8,116
Changes in fair value	(2,574)		919		(1,655)
Liabilities at December 31, 2021	—		6,461		6,461
Changes in fair value	—		(566)		(566)
Liabilities at December 31, 2022	$	—	$	5,895	$	5,895

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 customer receivables and debt instruments (in thousands):

	December 31, 2022				December 31, 2021
	Net Carrying Value		Fair Value		Net Carrying Value		Fair Value
Customer receivables
Customer financing receivables	$	—	$	—	$	45,269	$	38,334
Debt instruments
Recourse:
10.25% Senior Secured Notes due March 2027	60,960		60,472		68,968		72,573
2.5% Green Convertible Senior Notes due August 2025	224,832		309,488		222,863		356,822
Non-recourse:
7.5% Term Loan due September 2028	—		—		29,006		35,669
6.07% Senior Secured Notes due March 2030	—		—		73,262		83,251
3.04% Senior Secured Notes due June 2031	125,787		117,028		132,631		137,983