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Goodwill and Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Carrying Value of Goodwill Attributable to Each Reportable Segment | The changes in the carrying value of goodwill balances by reportable segment were as follows:
| U.S. Regions |  | U.S. Federal |  | Canada |  | Non-solar DG |  | Other |  | Total
Balance, December 31, 2020 | $ | 26,705 |  |  | $ | 3,981 |  |  | $ | 3,441 |  |  | $ | — |  |  | $ | 24,587 |  |  | $ | 58,714 |
Currency effects | — |  |  | — |  |  | 9 |  |  | — |  |  | (94) |  |  | (85) |
Balance, September 30, 2021 | $ | 26,705 |  |  | $ | 3,981 |  |  | $ | 3,450 |  |  | $ | — |  |  | $ | 24,493 |  |  | $ | 58,629 |
Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets | Definite-lived intangible assets, net consisted of the following:
| As of September 30, 2021 |  | As of December 31, 2020
Gross carrying amount | $ | 27,143 |  |  | 27,240 |
Less - accumulated amortization | (26,456) |  |  | (26,313) |
Intangible assets, net | $ | 687 |  |  | $ | 927 |
Schedule of Amortization Expense | The table below sets forth amortization expense:
|  |  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Asset type |  | Location |  | 2021 |  | 2020 |  | 2021 |  | 2020
Customer contracts |  | Cost of revenues |  | $ | — |  |  | $ | 15 |  |  | $ | — |  |  | $ | 60 |
All other intangible assets |  | Selling, general and administrative expenses |  | 80 |  |  | 157 |  |  | 241 |  |  | 468 |
Total amortization expense |  |  |  | $ | 80 |  |  | $ | 172 |  |  | $ | 241 |  |  | $ | 528 |

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