Hercules Capital, Inc. Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Debt - Schedule of Available and Outstanding Debt (Details)

Debt - Schedule of Available and Outstanding Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Feb. 10, 2026	Dec. 31, 2025	Jun. 16, 2025	Mar. 10, 2025	Feb. 05, 2025	Jul. 09, 2024	Jun. 22, 2022	Jan. 20, 2022	Sep. 16, 2021	Mar. 04, 2021	Nov. 04, 2020	Oct. 27, 2020	Sep. 24, 2018
Debt Instrument [Line Items]
Total Available	$ 2,982,012		$ 2,782,136
Principal Outstanding	2,569,319		2,313,070
Carrying Value	2,539,032		2,286,444
SMBC LC Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	300,000
Term Loan \| SMBC LC Facility
Debt Instrument [Line Items]
Total Available	25,000
SBA Debentures
Debt Instrument [Line Items]
Total Available	350,000		350,000
Principal Outstanding	350,000		350,000
Carrying Value	341,301		341,012
Maximum borrowing capacity	350,000		350,000
SBA Debentures \| HC IV
Debt Instrument [Line Items]
Total Available	175,000
Maximum borrowing capacity	175,000		175,000										$ 175,000
SBA Debentures \| SBIC V
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000		175,000				$ 175,000
SBA Debentures \| HC IV and SBIC V
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000		175,000
March 2026 A Notes
Debt Instrument [Line Items]
Total Available	0		50,000									$ 50,000
Principal Outstanding	0		50,000
Carrying Value	0		49,984
March 2026 B Notes
Debt Instrument [Line Items]
Total Available	0		50,000								$ 50,000
Principal Outstanding	0		50,000
Carrying Value	0		49,983
September 2026 Notes
Debt Instrument [Line Items]
Total Available	325,000		325,000							$ 325,000
Principal Outstanding	325,000		325,000
Carrying Value	324,548		324,302
January 2027 Notes
Debt Instrument [Line Items]
Total Available	350,000		350,000						$ 350,000
Principal Outstanding	350,000		350,000
Carrying Value	348,928		348,596
2028 Convertible Notes
Debt Instrument [Line Items]
Total Available	287,500		287,500		$ 287,500
Principal Outstanding	287,500		287,500
Carrying Value	281,076		280,412
February 2029 Notes
Debt Instrument [Line Items]
Total Available	300,000	$ 300,000	0
Principal Outstanding	300,000		0
Carrying Value	294,267		0
June 2030 Notes
Debt Instrument [Line Items]
Total Available	350,000		350,000	$ 350,000
Principal Outstanding	350,000		350,000
Carrying Value	343,104		342,694
2031 Asset-Backed Notes
Debt Instrument [Line Items]
Total Available	64,512		64,636					$ 150,000
Principal Outstanding	64,512		64,636
Carrying Value	64,466		64,530
2033 Notes
Debt Instrument [Line Items]
Total Available	40,000		40,000											$ 40,000
Principal Outstanding	40,000		40,000
Carrying Value	39,178		39,151
MUFG Bank Facility
Debt Instrument [Line Items]
Total Available	440,000		440,000
Principal Outstanding	220,000		168,000
Carrying Value	220,000		168,000
SMBC Facility
Debt Instrument [Line Items]
Total Available	475,000		475,000
Principal Outstanding	282,307		277,934
Carrying Value	282,164		277,780
SMBC Facility \| SMBC LC Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000		175,000			$ 175,000
SMBC Facility \| Term Loan
Debt Instrument [Line Items]
Total Available	25,000		25,000
Principal Outstanding	25,000		25,000
Carrying Value	$ 24,900		$ 24,800