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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, 2021:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-Solar DG |  | All Other |  | Total
Project revenue | $ | 92,601 |  |  | $ | 77,075 |  |  | $ | 7,307 |  |  | $ | 9,241 |  |  | $ | 10,031 |  |  | $ | 196,255 |
O&M revenue | 5,303 |  |  | 11,742 |  |  | — |  |  | 2,462 |  |  | 89 |  |  | 19,596 |
Energy assets | 10,046 |  |  | 1,371 |  |  | 1,571 |  |  | 23,852 |  |  | 101 |  |  | 36,941 |
Integrated-PV | — |  |  | — |  |  | — |  |  | — |  |  | 10,721 |  |  | 10,721 |
Other | 1,520 |  |  | 12 |  |  | 1,996 |  |  | 16 |  |  | 6,863 |  |  | 10,407 |
Total revenues | $ | 109,470 |  |  | $ | 90,200 |  |  | $ | 10,874 |  |  | $ | 35,571 |  |  | $ | 27,805 |  |  | $ | 273,920 |
The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended June 30, 2020:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-Solar DG |  | All Other |  | Total
Project revenue | $ | 76,040 |  |  | $ | 72,220 |  |  | $ | 6,167 |  |  | $ | 3,004 |  |  | $ | 2,499 |  |  | $ | 159,930 |
O&M revenue | 4,283 |  |  | 10,755 |  |  | 17 |  |  | 2,120 |  |  | 133 |  |  | 17,308 |
Energy assets | 8,080 |  |  | 1,505 |  |  | 1,344 |  |  | 17,820 |  |  | — |  |  | 28,749 |
Integrated-PV | — |  |  | — |  |  | — |  |  | — |  |  | 8,530 |  |  | 8,530 |
Other | 1,171 |  |  | 11 |  |  | 1,507 |  |  | 185 |  |  | 5,645 |  |  | 8,519 |
Total revenues | $ | 89,574 |  |  | $ | 84,491 |  |  | $ | 9,035 |  |  | $ | 23,129 |  |  | $ | 16,807 |  |  | $ | 223,036 |
The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2021:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-Solar DG |  | All Other |  | Total
Project revenue | $ | 163,759 |  |  | $ | 167,164 |  |  | $ | 16,308 |  |  | $ | 13,895 |  |  | $ | 15,822 |  |  | $ | 376,948 |
O&M revenue | 9,613 |  |  | 23,182 |  |  | 26 |  |  | 5,099 |  |  | 160 |  |  | 38,080 |
Energy assets | 18,856 |  |  | 2,035 |  |  | 2,318 |  |  | 46,783 |  |  | 236 |  |  | 70,228 |
Integrated-PV | — |  |  | — |  |  | — |  |  | — |  |  | 19,875 |  |  | 19,875 |
Other | 2,515 |  |  | 33 |  |  | 3,865 |  |  | 162 |  |  | 14,416 |  |  | 20,991 |
Total revenues | $ | 194,743 |  |  | $ | 192,414 |  |  | $ | 22,517 |  |  | $ | 65,939 |  |  | $ | 50,509 |  |  | $ | 526,122 |
The following table presents our revenue disaggregated by line of business and reportable segment for the six months ended June 30, 2020:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-Solar DG |  | All Other |  | Total
Project revenue | $ | 147,533 |  |  | $ | 128,334 |  |  | $ | 15,031 |  |  | $ | 5,375 |  |  | $ | 8,086 |  |  | $ | 304,359 |
O&M revenue | 8,635 |  |  | 22,381 |  |  | 26 |  |  | 4,135 |  |  | 193 |  |  | 35,370 |
Energy assets | 16,934 |  |  | 2,224 |  |  | 2,007 |  |  | 35,806 |  |  | — |  |  | 56,971 |
Integrated-PV | — |  |  | — |  |  | — |  |  | — |  |  | 19,999 |  |  | 19,999 |
Other | 2,312 |  |  | 297 |  |  | 3,363 |  |  | 537 |  |  | 12,241 |  |  | 18,750 |
Total revenues | $ | 175,414 |  |  | $ | 153,236 |  |  | $ | 20,427 |  |  | $ | 45,853 |  |  | $ | 40,519 |  |  | $ | 435,449 |
The following table presents information related to our revenue recognized over time:
| Three Months Ended |  | Six Months Ended
| June 30, 2021 |  | June 30, 2020 |  | June 30, 2021 |  | June 30, 2020
Percentage of revenue recognized over time | 94% |  | 94% |  | 94% |  | 93%
The remainder 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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
United States | $ | 252,536 |  |  | $ | 211,218 |  |  | $ | 486,545 |  |  | $ | 407,157 |
Canada | 9,973 |  |  | 8,458 |  |  | 20,826 |  |  | 19,011 |
Other | 11,411 |  |  | 3,360 |  |  | 18,751 |  |  | 9,281 |
Total revenues | $ | 273,920 |  |  | $ | 223,036 |  |  | $ | 526,122 |  |  | $ | 435,449 |
Summary of Contract with Customer, Asset and Liability | The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers:
|  | June 30, 2021 |  | December 31, 2020
Accounts receivable, net |  | $ | 115,462 |  |  | $ | 125,010 |
Accounts receivable retainage, net |  | $ | 36,485 |  |  | $ | 30,189 |
Contract Assets: |  |  |  |
Costs and estimated earnings in excess of billings |  | $ | 195,027 |  |  | $ | 185,960 |
Contract Liabilities: |  |  |  |
Billings in excess of cost and estimated earnings |  | $ | 26,561 |  |  | $ | 33,984 |
Billings in excess of cost and estimated earnings, non-current (1) |  | 6,082 |  |  | 6,631 |
Total contract liabilities |  | $ | 32,643 |  |  | $ | 40,615 |
| June 30, 2020 |  | December 31, 2019
Accounts receivable, net | $ | 86,017 |  |  | $ | 95,863 |
Accounts receivable retainage, net | $ | 19,119 |  |  | $ | 16,976 |
Contract Assets: |  |  |
Costs and estimated earnings in excess of billings | $ | 195,391 |  |  | $ | 202,243 |
Contract Liabilities: |  |  |
Billings in excess of cost and estimated earnings | $ | 34,896 |  |  | $ | 26,618 |
Billings in excess of cost and estimated earnings, non-current (1) | 5,035 |  |  | 5,560 |
Total contract liabilities | $ | 39,931 |  |  | $ | 32,178 |
(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.

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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=123351226&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=123351226&loc=SL49130545-203045 + Details
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