Document and Entity Information
| Document and Entity Information | Mar. 14, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 14, 2022 |
| Entity Registrant Name | ISUN, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37707 |
| Entity Tax Identification Number | 42-2150172 |
| Entity Address, Address Line One | 400 Avenue D |
| Entity Address, Address Line Two | Suite 10 |
| Entity Address, City or Town | Williston |
| Entity Address, State or Province | VT |
| Entity Address, Postal Zip Code | 05495 |
| City Area Code | 802 |
| Local Phone Number | 658-3378 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001634447 |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | ISUN |
| Security Exchange Name | NASDAQ |