Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Feb. 08, 2022
Document Information [Line Items]
Document Type	10-Q/A
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2021
Entity File Number	001-40402
Entity Registrant Name	OSIRIS ACQUISITION CORP.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-3636928
Entity Address, Address Line One	95 5th Avenue, 6th Floor
Entity Address, City or Town	New York,
Entity Address State Or Province	NY
Entity Address, Postal Zip Code	10003
City Area Code	646
Local Phone Number	993-4635
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
Entity Central Index Key	0001832136
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Description	Amendment No. 1
Amendment Flag	true
Transition Report	false
Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-half of one public warrant
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock, $0.0001 par value, and one-half of one public warrant
Trading Symbol	OSLU
Security Exchange Name	NYSE
Class A common stock
Document Information [Line Items]
Title of 12(b) Security	Shares of Class A common stock included as part of the units
Trading Symbol	OSI
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		23,000,000
Warrants included as part of the units
Document Information [Line Items]
Title of 12(b) Security	Warrants included as part of the units
Trading Symbol	OSI WS
Security Exchange Name	NYSE
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,750,000