Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021:


	U.S. Regions		U.S. Federal		Canada		Non-Solar DG		All Other		Total
Project revenue	$	71,158	$	90,089	$	9,001	$	4,654	$	5,791	$	180,693
O&M revenue	4,310		11,440		26		2,637		71		18,484
Energy assets	8,810		664		747		22,931		135		33,287
Integrated-PV	—		—		—		—		9,154		9,154
Other	995		21		1,869		146		7,553		10,584
Total revenues	$	85,273	$	102,214	$	11,643	$	30,368	$	22,704	$	252,202

The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2020:


	U.S. Regions		U.S. Federal		Canada		Non-Solar DG		All Other		Total
Project revenue	$	71,493	$	56,114	$	8,864	$	2,371	$	5,587	$	144,429
O&M revenue	4,352		11,626		9		2,015		60		18,062
Energy assets	8,854		719		663		17,986		—		28,222
Integrated-PV	—		—		—		—		11,469		11,469
Other	1,141		286		1,856		352		6,596		10,231
Total revenues	$	85,840	$	68,745	$	11,392	$	22,724	$	23,712	$	212,413

For the three months ended March 31, 2021 and 2020, approximately 94% and 91%, respectively, of revenue is recognized over time, and the remainder is for products and services transferred at a point in time.

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,
	2021		2020
United States	$	234,009	$	195,939
Canada	10,853		10,553
Other	7,340		5,921
Total revenues	$	252,202	$	212,413

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, 2021		December 31, 2020
Accounts receivable, net	$	113,095	$	125,010
Accounts receivable retainage, net	$	32,071	$	30,189

Contract Assets:
Costs and estimated earnings in excess of billings	$	179,474	$	185,960

Contract Liabilities:
Billings in excess of cost and estimated earnings	$	30,211	$	33,984
Billings in excess of cost and estimated earnings, non-current (1)	6,590		6,631
Total contract liabilities	$	36,801	$	40,615


	March 31, 2020		December 31, 2019
Accounts receivable, net	$	110,742	$	95,863
Accounts receivable retainage, net	$	21,265	$	16,976

Contract Assets:
Costs and estimated earnings in excess of billings	$	189,566	$	202,243

Contract Liabilities:
Billings in excess of cost and estimated earnings	$	25,350	$	26,618
Billings in excess of cost and estimated earnings, non-current (1)	5,320		5,560
Total contract liabilities	$	30,670	$	32,178

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