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Data Current Issuance of equity securities for services (in shares) Stock Issued During Period, Shares, Issued for Services Warrants and rights exercisable, term Warrants and Rights Exercisable, Term Warrants and Rights Exercisable, Term Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Weighted average number of shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Prepaid clinical trial expenses Prepaid Clinical Trial Expense Prepaid Clinical Trial Expense Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Grants received Proceeds From Grants Received Proceeds From Grants Received Accumulated deficit Retained Earnings (Accumulated Deficit) Commitments and Contingencies Disclosure [Abstract] 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