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and Contingencies Disclosure [Text Block] Hercules Capital, Inc. Hercules Capital, Inc. [Member] Hercules Capital, Inc. 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Long-Term Debt, Gross Shareholders’ Equity/(Deficit) Equity [Text Block] Net income (loss) Net income (loss) Net income (loss), as reported Net Income (Loss) Attributable to Parent Loan Agreement Loan Agreement [Member] Loan Agreement Expiration Date Trading Arrangement Expiration Date NON-CURRENT LIABILITIES: Liabilities, Noncurrent [Abstract] Market capitalization Debt Instrument, Market Capitalization Debt Instrument, Market Capitalization Prepaid Expenses and Other Current Assets Other Current Assets [Text Block] Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Number of tranches Debt Instrument, Number Of Tranches Debt Instrument, Number Of Tranches Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Loss from operations: Operating Income (Loss) Accumulated deficit Accumulated deficit 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Diluted [Table Text Block] Pre-funded Warrants Prefunded Warrants [Member] Prefunded Warrants Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Issuance costs of warrant Issuance of Stock and Warrants for Services or Claims Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in GBP per share) Common Stock, Par or Stated Value Per Share Common stock, issued (in shares) Common Stock, Shares, Issued December 31, 2030 Long-Term Debt, Maturity, Year Four Effect of dilutive securities Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Use of Estimates Use of Estimates, Policy [Policy Text Block] Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Proceeds from the issuance of pre-funded warrants associated with ADS warrant exercises Proceeds from issuance of pre-funded warrants, net of issuance costs Proceeds from Issuance of Warrants Security Exchange Name Security Exchange Name Interim Period, Costs Not Allocable [Domain] Interim Period, Costs Not Allocable [Domain] Borrowed in drawings of a minimum Debt Instrument, Minimum Drawings, Amount Debt Instrument, Minimum Drawings, Amount December 31, 2026 Long-Term Debt, Maturity, Remainder of Fiscal Year Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] OPERATING EXPENSES: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] American Depositary Shares American Depositary Shares [Member] American Depositary Shares Issuance of ordinary shares, net of issuance costs Stock Issued During Period, Value, New Issues Development expenses Development Expenses [Member] Development Expenses Statement [Line Items] Statement [Line Items] Debt Instrument, Redemption, Period Five Debt Instrument, Redemption, Period Five [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Number of options exercisable (in shares) Options, Exercisable, Number Options, Exercisable, Number Deferred and prepaid tax assets Increase (Decrease) in Deferred Income Taxes ORDINARY SHARES Common Stock [Member] Benefit from R&D tax credit Research And Development Tax Credit, Income Tax Expense (Benefit) Research And Development Tax Credit, Income Tax Expense (Benefit) Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation