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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 11, 2022
Jun. 30, 2021
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    
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 false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Document Type 10-K    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
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 9020 N Capital of Texas Hwy    
Entity Address, Address Line Two 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    
Entity Common Stock, Shares Outstanding   99,144,385  
Entity Public Float     $ 360,590,194
Document Transition Report false    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Austin, Texas    
Auditor Firm ID 238    
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 2022 Proxy Statement for the Annual Meeting of Stockholders, to be filed on or before April 30, 2022, are incorporated by reference into Part III of this report.