Document and Entity Information - shares	9 Months Ended
	Mar. 31, 2020	May 08, 2020
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Registrant Name	LifeSci Acquisition Corp.
Entity Central Index Key	0001796129
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		8,204,709
Entity Shell Company	true
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity File Number	001-39244
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-3197402
Entity Address, Address Line One	250 W. 55th St., #3401
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
City Area Code	646
Local Phone Number	899-1200
Document Quarterly Report	true
Document Transition Report	false
Title of each class	Common Stock
Trading Symbol(s)	LSAC
Name of each exchange on which registered	NASDAQ
Warrants
Document And Entity Information [Line Items]
Title of each class	Warrants
Trading Symbol(s)	LSACW
Name of each exchange on which registered	NASDAQ
Units
Document And Entity Information [Line Items]
Title of each class	Units
Trading Symbol(s)	LSACU
Name of each exchange on which registered	NASDAQ