Warrants (Tables)

12 Months Ended

Dec. 31, 2012

	Shares	Weighted Average Exercise Price	Range of Exercise Prices
Outstanding at December 31, 2010	942,870	$16.36	$2.80 - $169.47
Warrants issued	61,076	$4.50	$4.50
Warrants exercised	(49,779)	$7.92	$7.92
Warrants expired / forfeited	(24,253)	$50.95	$50.63 - $60.00
Outstanding at December 31, 2011	929,914	$15.13	$2.80 - $169.47
Warrants issued	50,000	$2.26	$2.09 - $3.80
Warrants expired / forfeited	(56,824)	$123.37	$75.00– $169.47
Outstanding at December 31, 2012	923,090	$7.77	$2.09 – $48.90
Warrants exercisable at December 31, 2012	863,090	$7.92	$2.09 – $48.90

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Number Outstanding	Exercise Price	Issuance Date	Expiration Date
7,577	$48.90	9/26/03	9/25/2013
9,859	$2.80	6/25/2008	10/1/2014
616,245	$7.92	10/15/2010	10/15/2013
25,000	$7.92	12/21/2010	12/21/2013
128,333	$7.92	12/22/2010	12/22/2013
25,000	$10.40	12/30/2010	6/30/2016
61,076	$4.50	7/5/2011	6/28/2016
5,000	$3.80	2/16/2012	8/16/2017
45,000	$2.09	7/27/2012	7/27/2018

Schedule of Reconciliation, Warranty Liability [Table Text Block]

	Years Ended December 31,
	2012	2011
Balance at beginning of year	$ 100	$ 1,238
Exercise of common stock warrants	─	(39)
Remeasurement of common stock warrants	(90)	(1,099)
Balance at end of year	$ 10	$ 100

Black-Scholes [Member]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

	2012
Expected volatility	91.6%
Risk-free interest rate	0.9%
Dividend yield	─
Expected life in years	6.0
Weighted average grant date fair value	$1.57

Monte Carlo [Member]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

	December 31,
	2012	2011
Expected volatility	71.3%	58.8%
Risk-free interest rate	0.3%	0.7%
Closing price of Clean Diesel Technologies, Inc. common stock	$2.17	$2.80