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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 24, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Entity File Number 001-39958    
Registrant Name TRINITY CAPITAL INC.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 35-2670395    
Entity Address, State or Province AZ    
Entity Address, Address Line One 1 N. 1st Street    
Entity Address, Address Line Two Suite 302    
Entity Address, City or Town Phoenix    
Entity Address, Postal Zip Code 85004    
City Area Code 480    
Local Phone Number 374‑5350    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   62,831,103  
CIK 0001786108    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment false    
Entity Interactive Data Current Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 683,412,981
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement for its 2025 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission within 120 days following the end of the registrant’s fiscal year, are incorporated by reference into Part III of this annual report on Form 10-K.

    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Los Angeles, CA    
Auditor Opinion

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of assets and liabilities of Trinity Capital Inc. (the Company), including the consolidated schedules of investments, as of December 31, 2024 and 2023, the related consolidated statements of operations, changes in net assets, and cash flows for each of the three years in the period ended December 31, 2024, 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, 2024 and 2023, and the results of its operations, changes in its net assets, and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

    
Common Stock, par value $0.001 per share [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol TRIN    
Security Exchange Name NASDAQ    
Notes Due 2029 [Member]      
Document Information [Line Items]      
Title of 12(b) Security 7.875% Notes Due 2029    
Trading Symbol TRINZ    
Security Exchange Name NASDAQ    
Notes Due 2029 Two [Member]      
Document Information [Line Items]      
Title of 12(b) Security 7.875% Notes Due 2029    
Trading Symbol TRINI    
Security Exchange Name NASDAQ