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Stockholders' Equity - Schedule of Reserve Share of Common Stock for Issuance (Details) - shares | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 31, 2015
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) | 49,898,000 | 55,467,000 |
Options outstanding |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) | 5,217,000 | 6,257,000 |
Restricted stock units outstanding |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) | 4,542,000 | 4,485,000 |
Sunrun-VSI 2014 Equity Incentive Plan | Employee Stock |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) | 9,534,000 | 11,084,000 |
2015 Equity Incentive Plan |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) |  |  | 11,400,000
2015 Equity Incentive Plan | Employee Stock |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) | 20,534,000 | 22,371,000 |
2015 Employee Stock Purchase Plan | Employee Stock |  |  |
Class of Stock [Line Items] |  |  |
Shares of common stock reserved for issuance (in shares) | 10,071,000 | 11,270,000 |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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