Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2020	Jan. 29, 2021
Document and Entity Information
Document Type	10-Q
Document Period End Date	Dec. 31, 2020
Entity Registrant Name	Lifesci Acquisition II Corp.
Entity Current Reporting Status	Yes
Transition Report	true
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 Common Stock, Shares Outstanding		10,011,301
Entity Central Index Key	0001819113
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
Trading Symbol	LSAQ
Title of 12(b) Security	Shares of Common Stock, $0.0001 par value
Security Exchange Name	NASDAQ