Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Dec. 14, 2021
Entity Listings [Line Items]
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	This Amendment No. 1 to Arya Sciences Acquisition Corp IV’s Quarterly Report on Form 10-Q (the “Amendment No. 1 to the Quarterly Report on From 10-Q”) amends the Quarterly Report on Form 10-Q of Arya Sciences Acquisition Corp IV (the “Company”) as of and for the period ended September 30, 2021, as filed with the U.S. Securities and Exchange Commission (the “SEC”) on November 12, 2021. On March 2, 2021, the Company consummated its initial public offering (“Initial Public Offering”) of 14,950,000 Class A ordinary shares (the “Public Shares”), including the 1,950,000 Public Shares as a result of the underwriters’ full exercise of their over-allotment option, at an offering price of $10.00 per Public Share, generating gross proceeds of $149.5 million. Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 499,000 Class A ordinary shares (the “Private Placement Shares”), at a price of $10.00 per Private Placement Share to the Sponsor, generating gross proceeds of approximately $5.0 million. On November 12, 2021, the Company filed its Form 10-Q for the quarterly period ending September 30, 2021 (the “Q3 Form 10-Q”), which included a Note 2, Revision of Previously Issued Financial Statements, (“Note 2”) that describes a revision to the Company’s classification of its Public Shares issued in the Company’s Initial Public Offering on March 2, 2021. As described in Note 2, upon its Initial Public Offering, the Company classified a portion of the Public Shares as permanent equity to maintain net tangible assets greater than $5,000,000 on the basis that the Company will consummate its initial business combination only if the Company has net tangible assets of at least $5,000,001. The Company’s management re-evaluated the conclusion and determined that the Public Shares included certain provisions that require classification of the Public Shares as temporary equity. As a result, management corrected the error by reclassifying all Public Shares as temporary equity. This resulted in an adjustment to the initial carrying value of the Class A ordinary shares subject to possible redemption with the offset recorded to additional paid-in capital (to the extent available), accumulated deficit and Class A ordinary shares. In connection with the change in presentation for the Class A ordinary shares subject to possible redemption, the Company restated its earnings per share calculation to allocate income and losses shared pro rata between the two classes of shares. The Company determined the changes were not qualitatively material to the Company’s previously issued financial statements and did not restate its financial statements. Instead, the Company revised its previously filed financial statements in Note 2 to its Q3 Form 10-Q. Although the qualitative factors that management assessed tended to support a conclusion that the misstatements were not material, these factors were not strong enough to overcome the significant quantitative errors in the financial statements. The qualitative and quantitative factors support a conclusion that the misstatements are material on a quantitative basis. Management concluded that the misstatement was such of magnitude that it is probable that the judgment of a reasonable person relying upon the financial statements would have been influenced by the inclusion or correction of the foregoing items. As such, upon further consideration of the change, the Company determined the change in classification of the Public Shares and change to its presentation of earnings per share is material quantitatively and it should restate its previously issued financial statements. Therefore, on December 1, 2021, the Company’s management and the audit committee of the Company’s board of directors (the “Audit Committee”) concluded that the Company’s previously issued (i) audited balance sheet as of March 2, 2021 (the “Post-IPO Balance Sheet”), filed with the SEC on March 8, 2021, (ii) unaudited interim financial statements included in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2021, filed with the SEC on May 13, 2021; and (iii) unaudited interim financial statements included in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2021, filed with the SEC on August 12, 2021 (collectively, the “Affected Periods”), should be restated to report all Public Shares as temporary equity and should no longer be relied upon. As such, the Company will restate its quarterly financial statements for the Affected Periods in this Amendment No. 1 to the Quarterly Report on Form 10-Q. The Post-IPO Balance Sheet will be restated in an amendment to the current report on Form 8-K that was initially filed with the SEC on March 8, 2021. The restatement had no impact on the Company's cash position and cash held in the trust account established in connection with the Initial Public Offering. After re-evaluation, the Company’s management has concluded that in light of the errors described above, a material weakness existed in the Company’s internal control over financial reporting during the Affected Periods and that the Company’s disclosure controls and procedures were not effective. The Company’s remediation plan with respect to such material weakness is described in more detail in Item 4 of Part I to this Amendment No. 1 to the Quarterly Report on Form 10-Q.
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Document Transition Report	false
Entity File Number	001-40122
Entity Registrant Name	ARYA SCIENCES ACQUISITION CORP IV
Entity Central Index Key	0001838821
Entity Incorporation, State or Country Code	E9
Entity Tax Identification Number	98-1574672
Entity Address, Address Line One	51 Astor Place, 10th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10003
City Area Code	212
Local Phone Number	284-2300
Title of 12(b) Security	Class A Ordinary Share, $0.0001 par value
Trading Symbol	ARYD
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Class A Ordinary Shares [Member]
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		15,449,000
Class B Ordinary Shares [Member]
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		3,737,500