Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2024

Revenue from Contract with Customer [Abstract]

The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2024:


	North America Regions		U.S. Federal		Europe		Alternative Fuels		All Other		Total
Project revenue	$	116,211	$	43,479	$	41,424	$	3,163	$	7	$	204,284
O&M revenue	6,933		15,278		747		2,377		—		25,335
Energy assets	13,754		1,929		171		27,300		—		43,154

Other	1,387		204		1,780		19		22,243		25,633
Total revenues	$	138,285	$	60,890	$	44,122	$	32,859	$	22,250	$	298,406

The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2023:


	North America Regions		U.S. Federal		Europe		Alternative Fuels		All Other		Total
Project revenue	$	119,231	$	45,549	$	17,200	$	—	$	1,250	$	183,230
O&M revenue	5,539		12,700		333		3,686		—		22,258
Energy assets	14,407		1,076		519		24,653		117		40,772

Other	1,365		231		1,044		—		22,142		24,782
Total revenues	$	140,542	$	59,556	$	19,096	$	28,339	$	23,509	$	271,042

The following table presents information related to our revenue recognized over time:


	Three Months Ended March 31,
	2024	2023
Percentage of revenue recognized over time	94%	93%

The remainder of our revenue is for products and services transferred at a point in time, at which point revenue is recognized.

We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area:


	Three Months Ended March 31,
	2024		2023
United States	$	239,099	$	233,084
Canada	15,180		17,234
Europe	44,127		20,724
Total revenues	$	298,406	$	271,042

Summary of Contract with Customer, Asset and Liability

The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers:


	March 31, 2024		December 31, 2023
Accounts receivable, net	$	146,836	$	153,362
Accounts receivable retainage, net	32,158		33,826
Contract Assets:
Costs and estimated earnings in excess of billings	$	652,428	$	636,163
Contract Liabilities:
Billings in excess of cost and estimated earnings	$	61,267	$	52,903
Billings in excess of cost and estimated earnings, non-current (1)	19,883		18,688
Total contract liabilities	$	81,150	$	71,591


	March 31, 2023		December 31, 2022
Accounts receivable, net	$	130,940	$	174,009
Accounts receivable retainage, net	35,625		38,057
Contract Assets:
Costs and estimated earnings in excess of billings	$	497,762	$	576,363
Contract Liabilities:
Billings in excess of cost and estimated earnings	$	39,326	$	34,796
Billings in excess of cost and estimated earnings, non-current (1)	12,510		7,617
Total contract liabilities	$	51,836	$	42,413

(1) Performance obligations that are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets.