Document And Entity Information	3 Months Ended
	Mar. 31, 2014	May 05, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	CLEAN DIESEL TECHNOLOGIES INC
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		12,352,747
Amendment Flag	false
Entity Central Index Key	0000949428
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1