    <SEC-DOCUMENT>0001193125-25-140102-index.html : 20250613
    <SEC-HEADER>0001193125-25-140102.hdr.sgml : 20250613
    <ACCEPTANCE-DATETIME>20250612184117
    ACCESSION NUMBER:		0001193125-25-140102
    CONFORMED SUBMISSION TYPE:	424B2
    PUBLIC DOCUMENT COUNT:		20
    FILED AS OF DATE:		20250613
    DATE AS OF CHANGE:		20250612

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Hercules Capital, Inc.
    		CENTRAL INDEX KEY:			0001280784
    		ORGANIZATION NAME:
    		EIN:				743113410
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		424B2
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-283735
    		FILM NUMBER:		251044234

    	BUSINESS ADDRESS:
    		STREET 1:		1 NORTH B STREET
    		STREET 2:		SUITE 2000
    		CITY:			SAN MATEO
    		STATE:			CA
    		ZIP:			94401
    		BUSINESS PHONE:		650-289-3060

    	MAIL ADDRESS:
    		STREET 1:		1 NORTH B STREET
    		STREET 2:		SUITE 2000
    		CITY:			SAN MATEO
    		STATE:			CA
    		ZIP:			94401

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	HERCULES TECHNOLOGY GROWTH CAPITAL INC
    		DATE OF NAME CHANGE:	20040219
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>424B2
    <SEQUENCE>1
    <FILENAME>d930668d424b2.htm
    <DESCRIPTION>424B2
    <TEXT>
    Document 1 - file: d930668d424b2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-FILING FEES
    <SEQUENCE>2
    <FILENAME>d930668dexfilingfees.htm
    <DESCRIPTION>EX-FILING FEES
    <TEXT>
    Document 2 - file: d930668dexfilingfees.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>htgc-20250612.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 3 - file: htgc-20250612.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>4
    <FILENAME>htgc-20250612_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
    <TEXT>
    Document 4 - file: htgc-20250612_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>5
    <FILENAME>htgc-20250612_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 5 - file: htgc-20250612_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>6
    <FILENAME>htgc-20250612_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 6 - file: htgc-20250612_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g930668g36w13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g930668g36w13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>9
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 9 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>11
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>12
    <FILENAME>R3.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 12 - file: R3.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>R4.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 13 - file: R4.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 14 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 15 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>18
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: FilingSummary.html

    Document 18 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>21
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>22
    <FILENAME>0001193125-25-140102-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: 0001193125-25-140102-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>d930668d424b2_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: d930668d424b2_htm.html

    Document 23 - RAW XML: d930668d424b2_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>24
    <FILENAME>d930668dexfilingfees_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 24 - file: d930668dexfilingfees_htm.html

    Document 24 - RAW XML: d930668dexfilingfees_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>