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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenue from Contract with Customer [Abstract] |
Summary of Disaggregation of Revenue | 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.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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