Preliminary proxy statement not related to a contested matter or merger/acquisition

N-2

v3.25.1
N-2 - $ / shares
 3 Months Ended 12 Months Ended
Apr. 08, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2024
Cover [Abstract]                              
Entity Central Index Key                             0001280784
Amendment Flag                             false
Document Type                             PRE 14A
Entity Registrant Name                             Hercules Capital, Inc.
General Description of Registrant [Abstract]                              
Share Price [Table Text Block]                            
Table 3.3 (Trading History of the Shares)
Price Range
NAV(1)
High Low
High Sales Price Premium
(Discount) to NAV(2)
Low Sales Price Premium
(Discount) to NAV(2)
2022
First quarter $ 10.82  $ 18.23  $ 16.65  68.5  % 53.0  %
Second quarter $ 10.43  $ 18.91  $ 12.82  81.3  % 22.9  %
Third quarter $ 10.47  $ 16.13  $ 11.45  54.1  % 9.4  %
Fourth quarter $ 10.53  $ 14.92  $ 11.59  41.7  % 10.1  %
2023
First quarter $ 10.82  $ 16.24  $ 11.56  50.1  % 6.8  %
Second quarter $ 10.96  $ 15.08  $ 12.38  37.6  % 13.0  %
Third quarter $ 10.93  $ 18.02  $ 14.86  64.9  % 36.0  %
Fourth quarter $ 11.43  $ 16.93  $ 15.09  48.2  % 32.1  %
2024
First quarter $ 11.63  $ 18.77  $ 16.67  61.4  % 43.3  %
Second quarter $ 11.43  $ 19.92  $ 17.07  74.3  % 49.3  %
Third quarter $ 11.40  $ 21.67  $ 17.71  90.1  % 55.4  %
Fourth quarter $ 11.66  $ 20.22  $ 18.53  73.4  % 58.9  %
2025
First quarter
$   * $ 22.04  $ 17.93 
*
*
Second quarter (through April 8, 2025)
 $   * $ 19.37  $ 15.65 
*
*
(1)NAV is determined as of the last day in the relevant quarter and therefore may not reflect NAV on the date of the high and low closing sales prices. The NAVs shown are based on outstanding Shares at the end of the relevant quarter.
(2)     Calculated as the respective high or low closing sales price less NAV, divided by NAV (in each case as of the applicable quarter).
*NAV has not yet been calculated for the period.
Lowest Price or Bid $ 15.65 $ 17.93 $ 18.53 $ 17.71 $ 17.07 $ 16.67 $ 15.09 $ 14.86 $ 12.38 $ 11.56 $ 11.59 $ 11.45 $ 12.82 $ 16.65  
Highest Price or Bid 19.37 22.04 $ 20.22 $ 21.67 $ 19.92 $ 18.77 $ 16.93 $ 18.02 $ 15.08 $ 16.24 $ 14.92 $ 16.13 $ 18.91 $ 18.23  
Highest Price or Bid, Premium (Discount) to NAV [Percent]     73.40% 90.10% 74.30% 61.40% 48.20% 64.90% 37.60% 50.10% 41.70% 54.10% 81.30% 68.50%  
Lowest Price or Bid, Premium (Discount) to NAV [Percent]     58.90% 55.40% 49.30% 43.30% 32.10% 36.00% 13.00% 6.80% 10.10% 9.40% 22.90% 53.00%  
NAV Per Share $ 11.66 $ 11.40 $ 11.43 $ 11.63 $ 11.43 $ 10.93 $ 10.96 $ 10.82 $ 10.53 $ 10.47 $ 10.43 $ 10.82 $ 11.66