Document And Entity Information - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2017	Mar. 20, 2018	Jun. 30, 2017
Document Information [Line Items]
Entity Registrant Name	CESCA THERAPEUTICS INC.
Entity Central Index Key	0000811212
Trading Symbol	kool
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		10,872,428
Entity Public Float			$ 9,714
Document Type	10-KT
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false