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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 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 Plan, 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 June 30, 2014, there were 136,936 shares available for future grants under the Plan. Total stock-based compensation expense for the three months ended June 30, 2014 and 2013 was $0.2 million. Total stock-based compensation expense for the six months ended June 30, 2014 and 2013 was $0.3 million and $0.4 million, respectively. Compensation expense is recognized on a straight-line basis over the requisite service period for all stock-based awards made to employees and directors in the unaudited condensed consolidated statements of comprehensive loss. 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 |  |  |  |  |
Exercised | (97,172) |  | $ | 2.83 |  |  |  |  |
Cancelled | (79,504) |  | $ | 2.83 |  |  |  |  |
Outstanding at June 30, 2014 | 538,036 |  | $ | 8.59 |  | 6.9 |  | $ | 16
Exercisable at June 30, 2014 | 459,171 |  | $ | 9.56 |  | 6.8 |  | $ | 11
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 quarter. As of June 30, 2014, the Company had $0.1 million of unrecognized compensation cost related to stock option grants which will be recognized over a weighted average estimated period of 0.7 years. Restricted Stock Units (“RSUs”) RSU activity is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Nonvested at December 31, 2013 (1) | 285,558 |  | $ | 2.35
Granted | 396,990 |  | $ | 2.97
Vested | (91,090) |  | $ | 2.57
Forfeited | (128,575) |  | $ | 2.25
Nonvested units at June 30, 2014 | 462,883 |  | $ | 2.87
(1) Includes 26,638 RSUs vested and unissued
As of June 30, 2014, the Company had $1.1 million of unrecognized compensation cost related to RSUs, which will be recognized over a weighted average estimated period of 2.2 years.

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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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