Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

No definition available.

Name:	dei_AmendmentFlag
Namespace Prefix:	dei_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

PCAOB issued Audit Firm Identifier

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 10-K
-Number 249
-Section 310

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 20-F
-Number 249
-Section 220
-Subsection f

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 40-F
-Number 249
-Section 240
-Subsection f

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2023	Mar. 05, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
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	Non-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		46,437,097
CIK	0001786108
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
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			$ 399,613,080
ICFR Auditor Attestation Flag	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive Proxy Statement for its 2024 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
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 2025 [Member]
Document Information [Line Items]
Title of 12(b) Security	7.00% Notes Due 2025
Trading Symbol	TRINL
Security Exchange Name	NASDAQ