Document and Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period BALANCE SHEETS Statement [Table] Statement [Line Items] Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Due from Related Parties, Current Due from Parent Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Equipment, net Operating Lease, Right-of-Use Asset Operating lease right-of-use asset Right to Use Asset Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT) Liabilities, Current [Abstract] Current liabilities Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Accrued expenses The amount due to parent Due to Parent, Current Due to Parent Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Operating Lease, Liability, Noncurrent Operating lease liabilities Operating lease liability Liabilities Total liabilities Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity Preferred Stock, Value, Issued Preferred stock, $0.001 par value, 10,000,000 shares authorized; no shares issued or outstanding Common Stock, Value, Issued Common stock, $0.001 par value, 50,000,000 shares authorized; 15,665,802 and 15,663,221 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively Additional Paid in Capital. Additional paid-in-capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Ending Balance Beginning Balance Total stockholders deficit and net Parent investment Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred shares, par value (dollar per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized (in shares) Preferred shares, authorized Preferred Stock, Shares Issued Preferred stock, shares issued (in shares) Preferred shares, issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding (in shares) Preferred shares, outstanding Common Stock, Par or Stated Value Per Share Common shares, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized (in shares) Common shares, authorized Common Stock, Shares, Issued Common stock, shares issued (in shares) Common shares, issued Common Stock, Shares, Outstanding Ending Balance (in shares) Beginning Balance (in shares) Common stock, shares outstanding (in shares) Common stock outstanding STATEMENTS OF OPERATIONS Costs and Expenses [Abstract] Operating costs and expenses Research and Development Expense Research and development General and Administrative Expense. General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Interest Expense [Abstract] Other income Interest Income (Expense), Nonoperating, Net Dividend and interest income, net Net Income (Loss) Attributable to Parent Net loss Net loss Earnings Per Share, Basic and Diluted Net loss per share attributable to common stockholders basic and diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average shares outstanding - basic and diluted (in shares) STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (DEFICIT) Stock Issued During Period, Value, New Issues Issuance of common shares Stock Issued During Period, Shares, New Issues Number of shares issued Issuance of common shares (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options exercised (in shares) Exercise of stock options (in shares) Payments of Stock Issuance Costs Issuance costs paid STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Reconciliation of net loss to net cash (used in) provided by operating activities: Reconciliation of net loss to net cash used in operating activities Depreciation, Depletion and Amortization Depreciation and amortization Share-based Compensation Stock-based compensation expense Represents the increase (decrease) in due to Parent under asset contribution agreement. Increase (Decrease) In Due To Parent Under Asset Contribution Agreement Due to Parent under asset contribution agreement Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable, accrued expenses and other Increase (Decrease) in Due to Related Parties Due to related party Payment to (received from) related party Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Payments to Acquire Productive Assets Purchases of equipment and leasehold improvements Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from Issuance of Common Stock Proceeds from issuance of common stock, net Excess Tax Benefit from Share-based Compensation, Financing Activities Exercise of options Due to parent. Due To Parent Due to Parent Proceeds from (Repayments of) Related Party Debt Note Payable — Parent Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents, end of the period Cash and cash equivalents, beginning of the period Supplemental Disclosures of Cash Flow Information Supplemental cash flow information: Interest Paid, Net Interest paid Noncash Investing and Financing Items [Abstract] Supplemental disclosure of non-cash Financing Activity: Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Deferred issuance costs, unpaid as of December 31, 2017 Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Deferred issuance costs reclassified to additional paid-in-capital upon completion of initial public offering. The amount of transfer to accumulated deficit from net parent investment. Transfer to accumulated deficit from net parent investment Reclassification of net Parent Investment in the Company to accumulated deficit. No definition available. Organization and Principal Activities The complete disclosure on the organization and principal activities of the entity. Organization and Principal Activities [Text Block] Organization and Principal Activities No definition available. Initial Public Offering The entire disclosure on the entity's initial public offering. Initial Public Offering [Text Block] Initial Public Offering No definition available. Liquidity and Going Concern Substantial Doubt about Going Concern [Text Block] Liquidity and Going Concern Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Transactions with BioXcel Related Party Transactions Disclosure [Text Block] Transactions with BioXcel Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property and Equipment Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Accrued Expenses and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses and Other Current Liabilities Stockholders’ Equity (Deficit) Stockholders' Equity Note Disclosure [Text Block] Stockholders’ Equity (Deficit) Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Income Taxes Income Tax Disclosure [Text Block] Income Taxes Leases Lessee, Operating Leases [Text Block] Leases Use of Estimates, Policy [Policy Text Block] Use of Estimates Disclosure of accounting policy for Unaudited Interim Consolidated Financial Information. Unaudited Interim Consolidated Financial Information [Policy Text Block] Unaudited Interim Financial Information Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Disclosure of accounting policy for deferred offering costs. Deferred Offering Costs [Policy Text Block] Deferred Offering Costs Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Lessee, Leases [Policy Text Block] Leases Compensation Related Costs, Policy [Policy Text Block] Stock-Based Compensation Research and Development Expense, Policy [Policy Text Block] Research and Development Costs Disclosure of accounting policy for patent costs. Patent Costs [Policy Text Block] Patent Costs Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurements Earnings Per Share, Policy [Policy Text Block] Net Loss per Share New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Property, Plant and Equipment [Table Text Block] Schedule of Property and Equipment Schedule of Accrued Liabilities [Table Text Block] Schedule of accrued expenses Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-Based Compensation Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Valuation Assumptions Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Stock Option Activity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Summary of maturities of the operating lease liability The number of advanced programs. Number of Advanced Program Number of advanced program The number of emerging programs. Number of Emerging Program Number of emerging programs Share Price Purchase price (in dollar per share) Fair value of grants per share The cash inflow from the additional capital contribution to the entity, gross of offering costs. Proceeds From Issuance Of Common Stock, Gross Gross proceeds from issuance of common stock Payments for Underwriting Expense Underwriting discounts and commissions Deferred Offering Costs. Deferred offering expenses Deferred offering costs Stockholders' Equity Note, Stock Split, Conversion Ratio Stock split The capital of a business which is used in its operations, calculated as the current assets minus the current liabilities. Working Capital Working capital Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Summary of Significant Accounting Policies Equipment The cost incurred directly with the issuance of an equity security, other than underwriting discounts and commissions. Stock Issuance Costs, Other than Underwriting Other offering expenses Property, Plant and Equipment, Useful Life Useful life Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive securities (in shares) Operating Lease, Liability Total lease liability Lease liability Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Line Items] Transactions with BioXcel The amount of lump sum payment payable to parent. Lump Sum Payment To Parent Lump sum payment to parent The period specified for payment. Maximum Threshold Period for Payment Period specified for payment The amount of cumulative net sales of any product or combination of products resulting from the development and commercialization of any one of the candidates or a product derived therefrom. Cumulative Net Sales Cumulative net sales Represents the amount of potential maximum payments that could be received under the collaborative agreement. Collaborative Arrangement, Milestone Payments Potential Potential milestone payments Represents the maximum percent of the milestone under the collaborative agreement. Collaborative Arrangement Milestone Potential Percent Maximum milestone (as as percent) Represents the term of the agreement. Term of Agreement Term of agreement Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Property, Plant and Equipment, Gross Equipment, Gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation Other Commitments [Table] Other Commitments [Line Items] Commitments and Contingencies Long-term Purchase Commitment, Period Expected term Long-term Purchase Commitment, Amount Expected cost Research and Development Expense (Excluding Acquired in Process Cost) Cost incurred Amount of costs incurred to date for the long term purchase commitment. Long-term Purchase Commitment, Cost Incurred to Date Cost incurred to date The percentage of cost that will be reimbursed by another party. Reimbursed Cost, Percent Reimbursed cost (as a percent) Receivables, Long-term Contracts or Programs Reimbursement receivable The amount of materials and clinical trial expenses. Accrued Materials And Clinical Trial Expenses, Current Drugs and clinical trial expenses Employee-related Liabilities, Current Accrued salaries, benefits and travel related costs Accrued Professional Fees, Current Professional and consultant fees The amount of legal expenses. Accrued Legal Expenses, Current Legal expenses Other Accrued Liabilities, Current Other administrative accruals Operating Lease, Liability, Current Less current portion Operating lease liabilities current portion Accrued Insurance, Current Insurance premiums payable The number of vote per common stock. Number of Vote per Common Stock Number of vote per common stock Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Authorized shares Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award Terms of award Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price Exercise price per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected stock price volatility, minimum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Expected stock price volatility, maximum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Risk-free rate of interest, minimum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free rate of interest, maximum (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected Term (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected dividend yield (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding, ending balance (in shares) Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options granted (in shares) Number of options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options vested and exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price per Share