Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Related Party [Axis] Related Party [Axis] Working Capital Loans [Member] Working Capital Loans [Member] Working capital loans to finance transaction costs in connection with a Business Combination. Equity Components [Axis] Equity Components [Axis] Ordinary shares, par value (in dollars per share) Temporary Equity, Par or Stated Value Per Share Offering Costs Deferred Charges, Policy [Policy Text Block] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Minimum [Member] Minimum [Member] Organization and Business Operations [Table] Organization and Business Operations [Table] Disclosure of information about the Company's organization and business operations. Founder Shares [Abstract] Founder Shares [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities and Shareholders' Equity: Liabilities and Equity [Abstract] Notes Payable, Related Parties Notes Payable, Related Parties Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Net Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Sale of units in initial public offering, gross (in shares) Shares Issued in Initial Public Offering During Period Shares New Issues Number of new shares issued during the period in initial public offering. Temporary Equity, Redemption Price Per Share Temporary Equity, Redemption Price Per Share Entity Ex Transition Period Entity Ex Transition Period Loss from operations Operating Income (Loss) Private Placement [Abstract] Private Placement [Abstract] Total current liabilities Liabilities, Current Subsequent Event Type [Domain] Subsequent Event Type [Domain] Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Assets held in Trust Account [Abstract] Assets, Fair Value Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Assets: Assets [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Payments for Underwriting Expense Payments for Underwriting Expense Cover [Abstract] Cover [Abstract] Document Type Document Type Number of trading days Number of Trading Days Number of trading days for common stock price to exceed threshold, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Investor [Member] Investor [Member] Investment Securities Held In Trust Account [Abstract] Investment Securities Held In Trust Account [Abstract] Sponsor Affiliate of Sponsor or Certain Company Officers and Directors [Member] Sponsor Affiliate of Sponsor or Certain Company Officers and Directors [Member] ARYA Sciences Holdings II (Sponsor), an affiliate of the Sponsor, or certain of the Company's officers and directors. Share price (in dollars per share) Shares Issued, Price Per Share Shares Issued, Price Per Share Common Class B [Member] Common Class B [Member] Other Liabilities and Financial Instruments Subject to Mandatory Redemption [Abstract] Other Liabilities and Financial Instruments Subject to Mandatory Redemption [Abstract] Underwriting discount (in dollars per share) Underwriting Discount Fee Underwriting discount fee per unit paid to underwriters. Sale of Stock [Axis] Sale of Stock [Axis] Sale of stock underwriter option term Sale of Stock Underwriter, Option Term Period of underwriter to purchase options. Proceeds from note payable to related party Proceeds from Related Party Debt Proceeds from Related Party Debt Basic and diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Private Placement Units [Member] Private Placement Units [Member] Security that gives the holder the right to purchase Private Placement Shares. Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Nautilus Biotechnology, Inc Nautilus Biotechnology, Inc [Member] Nautilus Biotechnology, Inc Preferred Stock, Value, Issued Preferred Stock, Value, Issued Notes Payable, Related Parties, Current Notes Payable, Related Parties, Current Cash Cash Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Interest from Trust Account that can be held to pay dissolution expenses Interest on Trust Account to be held to pay dissolution expenses Interest received on the Trust Account that can be used to pay dissolution expenses if a Business Combination is not completed with the Combination Period. Shares subject to possible redemption (in shares) Reclassifications of Permanent to Temporary Equity, Shares Number of shares subject to possible redemption reclassified to temporary equity. Sale of private placement units to Sponsor in private placement Sale of Units to Sponsor in Private Placement, Value Equity impact of the value of units issued to sponsor In private placement during the period. Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Initial value of Class A common stock subject to possible redemption Initial value of Class A common stock subject to possible redemption The amount of initial classification of common stock subject to redemption from noncash transactions. Nonoperating Income (Expense) [Abstract] Nonoperating Income (Expense) [Abstract] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Related Party Transaction, Amounts of Transaction Related Party Transaction, Amounts of Transaction Deferred underwriting commissions Deferred Underwriting Commissions Assumed in Underwriting Agreement The amount of deferred underwriting commissions assumed from the underwriting agreement related to the initial public offering. Measurement Frequency [Domain] Measurement Frequency [Domain] Related Party Transaction, Due from (to) Related Party [Abstract] Related Party Transaction, Due from (to) Related Party [Abstract] Asset Class [Domain] Asset Class [Domain] Equity [Abstract] Equity [Abstract] Share Price Share Price Investment, Policy [Policy Text Block] Investment, Policy [Policy Text Block] Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Offering costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Entity Central Index Key Entity Central Index Key Business Acquisition [Axis] Business Acquisition [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Statement [Line Items] Statement [Line Items] Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price Deferred offering costs paid by Sponsor in exchange for issuance of Class B ordinary shares Offering costs paid by sponsor in exchange for issuance of founder shares Deferred Offering Costs Paid by Sponsor in Exchange for Issuance of Ordinary Shares The amount of deferred offering costs paid by sponsor in exchange for ordinary shares in noncash financing activities. Prepaid expenses Increase (Decrease) in Prepaid Expenses, Other Class of Stock [Domain] Class of Stock [Domain] Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Preferred Stock, Shares Issued Preferred Stock, Shares Issued Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Unrecognized tax benefits Unrecognized Tax Benefits Business Combinations [Abstract] Business Combinations [Abstract] Common stock Common Stock, Value, Issued Earnings Per Share, Basic and Diluted Earnings Per Share, Basic and Diluted Administrative Support Agreement [Abstract] Administrative Support Agreement [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Administrative Support Agreement [Member] Administrative Support Agreement [Member] An agreement whereby, on the effective date of the registration statement on Form S-1 related to the Initial Public Offering through the earlier of consummation of the initial Business Combination and the Company's liquidation, the Company will pay a monthly fee for office space, utilities and secretarial and administrative support. Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Trading day threshold period Trading Days Threshold Threshold period of specified trading days that common stock price exceeds threshold price per share, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Prepaid Expense, Current Prepaid Expense, Current Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Related Party Transaction [Axis] Related Party Transaction [Axis] Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Business acquisition, equity value Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Net Cash Provided by (Used in) Investing Activities [Abstract] Net Cash Provided by (Used in) Investing Activities [Abstract] Common Stock, Shares, Issued Common Stock, Shares, Issued Amendment Flag Amendment Flag Net Asset Value Per Share Net Asset Value Per Share Proceeds from Issuance of Private Placement Gross proceeds from private placement Proceeds from Issuance of Private Placement Repayment of note payable to related party Repayments of Related Party Debt Repayments of Related Party Debt Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Related Party [Domain] Related Party [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Units issued (in shares) Units Issued During Period, Shares, New Issues Units Issued During Period, Shares, New Issues Number of new units issued during the period. Each unit consists of one share of Class A common stock. Public Shares [Member] Public Shares [Member] Units sold in a public offering that consist of Class A common stock. Class A ordinary shares, $0.0001 par value; 14,058,911 shares subject to possible redemption at $10.00 per share Temporary Equity, Carrying Amount, Attributable to Parent Total shareholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Number of shares no longer subject to forfeiture (in shares) Common Stock, Shares, No Longer Subject to Forfeiture Number of common stock shares no longer subject to forfeiture and fully exercised by the underwriters. Offering costs paid Payments of Stock Issuance Costs Ordinary shares including common stock subject to possible redemption shares, Outstanding Common Stock and Temporary Equity, Shares, Outstanding Number of shares of common stock and temporary equity outstanding. Common stock represent the ownership interest in a corporation. Cash equivalents Cash Equivalents, at Carrying Value Total Liabilities and Shareholders' Equity Liabilities and Equity Business acquisition, number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Subsequent Events Subsequent Events [Text Block] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Initial Public Offering [Abstract] Initial Public Offering [Abstract] Underwriting Agreement [Abstract] Underwriting Agreement [Abstract] General and Administrative Expense General and Administrative Expense Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Conversion of Stock, Amount Converted Conversion of Stock, Amount Converted Equity Component [Domain] Equity Component [Domain] Net Cash Provided by (Used in) Financing Activities [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] Sale of units in initial public offering, gross Shares Issued in Initial Public Offering During Period Value New Issues The value of new stock issued during the period in initial public offering. Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Net loss Net loss Net Income (Loss) Attributable to Parent Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Operating Capital [Abstract] Stock conversion basis at time of business combination Stock Conversion Ratio Ratio applied to the conversion of stock, for example but not limited to, one share converted to two or two shares converted to one. Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Change in value of Class A common stock subject to possible redemption Increase (Decrease) in Value of Common Stock Subject to Redemption The amount of change in value of common stock subject to redemption from noncash transactions. Total assets Assets Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Total current assets Assets, Current Earnings Per Share [Abstract] Earnings Per Share [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Entity Small Business Entity Small Business Offering costs included in note payable Offering Costs Included in Note Payable The amount of offering costs from noncash transactions included in note payable. Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Attributable to Parent [Abstract] Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration Risk, Credit Risk, Policy [Policy Text Block] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Organization and Business Operations [Line Items] Organization and Business Operations [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Entity Filer Category Entity Filer Category Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Liquidity and Capital Resources [Abstract] Liquidity and Capital Resources [Abstract] Total liabilities Liabilities Deferred underwriting commissions Deferred underwriting commissions Deferred Underwriting Fee Payable Non Current Carrying value as of the balance sheet date of outstanding underwriting fee payable initially due after one year or beyond the operating cycle if longer, excluding current portion. Offering costs included in accrued expenses Offering Costs Included in Accrued Expenses The amount of offering costs from noncash transactions included in accrued expenses. Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Common Stock [Member] Common Stock [Member] Monthly fee Related Party Transaction, Periodic Payment Amount Amount of the periodic payment due to related party during the financial reporting period. Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Proceeds from Issuance of Equity [Abstract] Proceeds from Issuance or Sale of Equity [Abstract] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Deferred Offering Costs Deferred Offering Costs Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] US Treasury Securities [Member] US Treasury Securities [Member] Stock Issued During Period, Shares, New Issues Shares issued (in shares) Stock Issued During Period, Shares, New Issues Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Money Market Funds [Member] Money Market Funds [Member] Amendment Description Amendment Description Common Class A [Member] Common Class A [Member] Class of Stock [Line Items] Class of Stock [Line Items] Accrued expenses Increase (Decrease) in Accrued Liabilities Asset Class [Axis] Asset Class [Axis] Threshold period after initial Business Combination Threshold Period after Initial Business Combination Threshold period after the initial Business Combination for the common stock price to exceed the threshold price per share, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Deferred underwriting commissions Deferred Underwriting Commissions Carrying value as of the balance sheet date of outstanding underwriting commissions payable initially due after one year or beyond the operating cycle if longer, excluding current portion. Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Income Taxes [Abstract] Income Tax Disclosure [Abstract] Basis of Accounting, Policy [Policy Text Block] Basis of Accounting, Policy [Policy Text Block] Independent Director Nominees [Member] Independent Director Nominees [Member] Independent directors nominated for serving the entity. Subsequent Events [Abstract] Subsequent Events [Abstract] Initial Public Offering [Member] IPO [Member] Subsequent Event Subsequent Event [Member] Sale of Stock [Domain] Sale of Stock [Domain] Shares subject to possible redemption Reclassifications Of Permanent To Temporary Equity Value Equity impact of the value of shares subject to possible redemption reclassified to temporary equity. Common Stock, Shares Authorized Common Stock, Shares Authorized Description of Organization, Business Operations and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Proceeds from Issuance Initial Public Offering Gross proceeds from initial public offering Proceeds from Issuance Initial Public Offering Additional Paid in Capital Additional Paid in Capital Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Sale of private placement units to Sponsor in private placement (in shares) Sale of Units to Sponsor in Private Placement Shares The number of unit issued to Sponsor in Private Placement. Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Class of Stock [Axis] Class of Stock [Axis] Working capital Working Capital The amount of difference between current assets and liabilities. Entity Registrant Name Entity Registrant Name Income Statement [Abstract] Income Statement [Abstract] Cash - beginning of the period Cash - end of the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Temporary Equity [Line Items] Temporary Equity [Line Items] Promissory Note [Member] Promissory Note to Cover Expenses Related to Initial Public Offering [Member] Loan of up to $300,000 to cover expenses related to the Initial Public Offering pursuant to a promissory note (Note). The Note was non-interest bearing and payable on the earlier of June 30, 2018 or the completion of the Initial Public Offering. Accrued expenses Accrued Liabilities, Current Over-Allotment Option [Member] Over-Allotment Option [Member] Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Period to not transfer, assign or sell Founder Shares Period of Restriction for Founder Shares for Initial Shareholders The period of time after the completion of initial business combination that initial shareholders are not permitted to transfer, assign or sell any of their held Founder Shares. Shares subject to forfeiture (in shares) Common Stock, Shares, Subject to Forfeiture Number of common stock shares subject to forfeiture in the event of the over-allotment option was not exercised by the underwriters. Ordinary shares subject to possible redemption (in shares) Temporary Equity, Shares Outstanding Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Aggregate gross proceeds Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Cash and Cash Equivalents, at Carrying Value [Abstract] Cash and Cash Equivalents, at Carrying Value [Abstract] Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Class A Ordinary Shares Subject to Possible Redemption Shares Subject to Possible Redemption [Policy Text Block] Disclosure of accounting policy for shares subject to possible redemption. Assets, Current [Abstract] Assets, Current [Abstract] Cash deposited in Trust Account Cash Deposited in Trust Account The cash outflow associated with cash deposit in trust account during the period. Investments, Fair Value Disclosure Investments, Fair Value Disclosure Related Party Transaction [Domain] Related Party Transaction [Domain] Ownership interest, as converted percentage Ownership Interest Percentage Threshold The ownership interest percentage threshold for the Company's issued and outstanding shares after the Initial Public Offering for the Founder Shares. Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Stock conversion percentage threshold Stock Conversion Percentage Threshold The stock conversion percentage threshold equal to the sum of the total number of all shares of common stock outstanding upon the completion of the Initial Public Offering plus all shares of Class A common stock and equity-linked securities issued or deemed issued in connection with the initial Business Combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination and any private placement-equivalent warrants issued to the Sponsor or its affiliates upon conversion of loans made to the Company). Maximum [Member] Maximum [Member] Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Gain (Loss) on Investments Gain (Loss) on Investments Net income on investments Gain (Loss) on Investments Retained Earnings [Member] Retained Earnings [Member] Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Investments held in Trust Account Assets Held-in-trust, Noncurrent Deferred underwriting discount (in dollars per share) Underwriting Discount Fee Deferred Deferred underwriting discount fee per unit payable to underwriters in the event the Company completes a Business Combination, subject to terms of the underwriting agreement. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Initial Public Offering [Abstract] Initial Public Offering of Units [Abstract] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operating Income (Loss) [Abstract] Operating Income (Loss) [Abstract] Net change in cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Private Placement [Member] Private Placement [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Liabilities, Current [Abstract] Liabilities, Current [Abstract] Initial Public Offering Initial Public Offering [Text Block] The entire disclosure for the initial public offering of the Company's common stock. Fair Value, Recurring [Member] Fair Value, Recurring [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]