Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2025	Mar. 20, 2026	Jun. 30, 2025
Cover [Abstract]
Entity Registrant Name	FTC SOLAR, INC.
Document Annual Report	true
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction Flag	false
Entity Central Index Key	0001828161
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Trading Symbol	FTCI
Amendment Flag	false
Title of 12(b) Security	Common Stock, $0.0001 par value
Security Exchange Name	NASDAQ
Entity File Number	001-40350
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-4816270
Entity Address, Address Line One	10900 Stonelake Blvd
Entity Address, Address Line Two	Suite 100
Entity Address, Address Line Three	Quarry Oaks II Building
Entity Address, City or Town	Austin
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78759
City Area Code	512
Local Phone Number	481-4271
Entity Common Stock, Shares Outstanding		15,585,198
Entity Public Float			$ 38,128,743
Document Transition Report	false
Auditor Name	BDO USA, P.C.
Auditor Location	Austin, Texas
Auditor Firm ID	243
Documents Incorporated by Reference	List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated: Portions of the registrant's 2026 Proxy Statement for the Annual Meeting of Stockholders, to be filed on or before April 30, 2026, are incorporated by reference into Part III of this report.
Auditor Opinion [Text Block]	Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of FTC Solar, Inc. (the “Company”) as of December 31, 2025 and 2024, the related consolidated statements of comprehensive loss, changes in stockholders' equity (deficit), and cash flows for each of the years then ended, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025 and 2024, and the results of its operations and its cash flows for the years then ended, in conformity with accounting principles generally accepted in the United States of America. Going Concern Uncertainty The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in Note 2 to the consolidated financial statements, the Company has recurring losses from operations and cash outflows from operations, is required to repay a portion of the principal amount outstanding under the Credit Agreement in 2026, and there is uncertainty as to the Company's ability to meet certain financial covenants required under the Credit Agreement that raise substantial doubt about its ability to continue as a going concern. Management's plans in regard to these matters are also described in Note 2. The consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Opinion on the Consolidated Financial Statements

Going Concern Uncertainty

FTC Solar, Inc. 10-K