| Document And Entity Information | Feb. 09, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 09, 2023 |
| Entity Registrant Name | FTC Solar, Inc. |
| Entity Central Index Key | 0001828161 |
| Entity Emerging Growth Company | true |
| Securities Act File Number | 001-40350 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 81-4816270 |
| Entity Address, Address Line One | 9020 N Capital of Texas Hwy, Suite I-260 |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78759 |
| City Area Code | 737 |
| Local Phone Number | 787-7906 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value |
| Trading Symbol | FTCI |
| Security Exchange Name | NASDAQ |
