Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Mar. 09, 2021	Jun. 30, 2020
Document and Entity Information [Abstract]
Entity Registrant Name	Protara Therapeutics, Inc.
Entity Central Index Key	0001359931
Amendment Flag	false
Document Type	10-K
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Document Period End Date	Dec. 31, 2020
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity File Number	001-36694
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,228,606
Entity Public Float			$ 76,900
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No