Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 16, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-36449
Entity Registrant Name	TRUECAR, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3807511
Entity Address, Address Line One	120 Broadway
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Santa Monica
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90401
City Area Code	800
Local Phone Number	200‑2000
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	TRUE
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 543,319,571
Entity Common Stock, Shares Outstanding		96,563,910
Documents Incorporated by Reference	Portions of the registrant’s Proxy Statement on Schedule 14A for the 2022 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. That Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2021. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.
Entity Central Index Key	0001327318
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false