Description of Business	3 Months Ended
Mar. 31, 2015
Disclosure Text Block [Abstract]
Business Description and Basis of Presentation [Text Block]	1. Description of Business Clean Diesel Technologies, Inc. (“CDTi” or the “Company”) currently commercializes its material technology by manufacturing and distributing light duty vehicle catalysts and heavy duty diesel emissions control systems and products to major automakers, distributors, integrators and retrofitters. Further, CDTi is evolving from being a niche manufacturer of emissions control solutions for the motor vehicle OEM, retrofit and aftermarket markets to becoming an advanced materials technology provider for these markets. CDTi’s business is driven by increasingly stringent global emission standards for internal combustion engines, which are major sources of a variety of harmful pollutants. It has operations in the United States (“U.S.”), Canada, the United Kingdom, France, Japan and Sweden as well as an Asian investment.

Description of Business

3 Months Ended

Mar. 31, 2015

Business Description and Basis of Presentation [Text Block]

1. Description of Business

Clean Diesel Technologies, Inc. (“CDTi” or the “Company”) currently commercializes its material technology by manufacturing and distributing light duty vehicle catalysts and heavy duty diesel emissions control systems and products to major automakers, distributors, integrators and retrofitters. Further, CDTi is evolving from being a niche manufacturer of emissions control solutions for the motor vehicle OEM, retrofit and aftermarket markets to becoming an advanced materials technology provider for these markets. CDTi’s business is driven by increasingly stringent global emission standards for internal combustion engines, which are major sources of a variety of harmful pollutants. It has operations in the United States (“U.S.”), Canada, the United Kingdom, France, Japan and Sweden as well as an Asian investment.