Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Aug. 03, 2022
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2022
Securities Act File Number	001-39958
Entity 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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		31,405,672
Entity Central Index Key	0001786108
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock, par value $0.001 per share [Member]
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	TRIN
Security Exchange Name	NASDAQ
Notes Due 2025 [Member]
Title of 12(b) Security	7.00% Notes Due 2025
Trading Symbol	TRINL
Security Exchange Name	NASDAQ