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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | 11. Stock-Based Compensation The Clean Diesel Technologies, Inc. Stock Incentive, as amended (the “Plan”), provides for the awarding of incentive stock options, non-qualified stock options, stock appreciation rights, restricted shares, performance awards, bonuses or other forms of share-based awards, or combinations of these to the Company’s directors, officers, employees, consultants and advisors (except consultants or advisors in capital-raising transactions) as determined by the board of directors. As of March 31, 2014, there were 217,832 shares available for future grants under the Plan. Total stock-based compensation expense for the three months ended March 31, 2014 and 2013 was $0.1 million and $0.2 million, respectively. Stock Options Stock option activity is summarized as follows:
| Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (thousands)
Outstanding at December 31, 2013 | 714,712 |  | $ | 7.17 |  |  | 7.58 |  |  | ─
Cancelled | (79,504) |  | $ | 2.83 |  |  |  |  |  |
Outstanding at March 31, 2014 | 635,208 |  | $ | 7.71 |  |  | 6.05 |  | $ | 355
Exercisable at March 31, 2014 | 556,343 |  | $ | 8.39 |  |  | 5.78 |  | $ | 286
The aggregate intrinsic value represents the difference between the exercise price and the Company’s closing stock price on the last trading day of the year. Compensation costs for stock options that vest over time are recognized over the vesting period on a straight-line basis. As of March 31, 2014, the Company had $0.1 million of unrecognized compensation cost related to stock option grants which will be recognized over a weighted estimated period of 0.9 years. Restricted Stock Units RSU activity is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013 | 312,196 |  | $ | 2.37 |
Granted | 288,760 |  | $ | 3.18 |
Vested and issued | (58,139) |  | $ | 2.06 |
Forfeited | (101,241) |  | $ | 2.14 |
Outstanding units at March 31, 2014 | 441,576 |  | $ | 2.91 |
Vested and unissued at March 31, 2014 | 59,589 |  | $ | 2.49 |
During the three months ended March 31, 2014, the Company granted 288,760 RSUs to executive officers and other key employees. The RSUs are time-based and vest over three years from the date of grant. As of March 31, 2014, the Company had $1.0 million of unrecognized compensation cost related to RSUs, which will be recognized over a weighted average estimated period of 2.7 years. In 2014, of the 58,139 shares vested, 6,817 vested shares were withheld for minimum statutory tax obligations, resulting in a net issuance of 51,322 shares.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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