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Warrants (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
           

 

Shares

 

Weighted

Average

Exercise

Price

 

Range of Exercise Prices

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

(11,709)

 

$ 75.00

 

$75.00

Outstanding at September 30, 2012

968,205

 

$ 13.74

 

$2.09 - $169.47

Warrants exercisable at September 30, 2012

908,205

 

$ 14.27

 

$2.09 - $169.47

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

 

 

 

 

 

September 30, 2012

 

December 31, 2011

Expected volatility

88.3%

 

58.8%

Risk-free interest rate

0.3%

 

0.7%

Closing price of Clean Diesel Technologies, Inc. common stock

$2.81

 

$2.80

       

 

 

 

 Nine Months Ended

 September 30,

 

 2012

 

 2011

Balance at beginning of period

$ 100

 

$ 1,238

Exercise of common stock warrants

 

(39)

Remeasurement of common stock warrants

59

 

(1,072)

Balance at end of period

$  159

 

$    127