Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of cash, cash equivalents, and restricted cash

	September 30, 2022		December 31, 2021
Current assets:
Cash and cash equivalents	$	25,286	$	39,314
Restricted cash - current (1)		41,419		—
Long-term assets:
Restricted cash held as collateral (2)		4,655		2,740
Total cash, cash equivalents, and restricted cash	$	71,360	$	42,054

⁽¹⁾ Restricted cash - current primarily consists of (i) $20,100 held in escrow to secure the Company’s purchase obligations under the forward purchase agreement with Meteora (See Note.3 Business Combination for additional information). (ii) $5,800 equity contribution to a joint venture in connection with the closing of OPAL Term Loan II (iii) $1,778 relates to interest reserve on Sunoma Loan and (iv) $13,700 held in a restricted account for funding one of our RNG projects.

⁽²⁾ Restricted cash held as collateral represents the collateral requirements on our debt facilities.

Schedule of asset retirement obligations

	September 30, 2022
Balance, December 31, 2021	$	5,738
Addition		(5	)
Accretion expense		235
Total asset retirement obligation		5,968
Less: current portion		(1,586	)
Total asset retirement obligation, net of current portion	$	4,382

Schedule of disaggregation of revenue

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Renewable power sales	$	9,666	$	9,551	$	27,205	$	28,162
Third party construction		18,660		14,078		41,476		23,348
Service		3,480		3,670		11,910		11,674
Brown gas sales		12,430		1,611		23,398		7,836
Environmental credits		19,649		13,202		58,444		25,198
Parts sales		1,355		633		2,332		532
Operating agreements		—		707		893		2,433
Other		70		2,273		236		2,499
Total revenue from contracts with customers		65,310		45,725		165,894		101,682
Lease revenue		1,240		1,459		2,920		3,286
Total revenue	$	66,550	$	47,184	$	168,814	$	104,968

Schedule of other income

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Reversal of contingent consideration on acquisition of non-controlling interest	$	4,365	$	—	$	4,365	$	—
Gain on redemption of Note receivable		1,943		—		1,943		—
Other income	$	6,308	$	—	$	6,308	$	—

Schedule of receivables, contract assets, and contract liabilities

	September 30, 2022		December 31, 2021
Accounts receivable, net	$	36,660	$	25,391
Contract assets:
Cost and estimated earnings in excess of billings	$	12,514	$	5,989
Accounts receivable retainage, net		2,162		2,495
Contract assets total	$	14,676	$	8,484
Contract liabilities:
Billings in excess of costs and estimated earnings	$	6,750	$	9,785
Contract liabilities total	$	6,750	$	9,785