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Stock Based Compensation (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Plans | Jun. 30, 2013
Stock-Based Compensation (Textual) |  |  |  |
Share-based compensation expense | $ 343,000 | $ 753,000 | $ 1,415,000 | $ 1,339,000
Weighted average grant date fair value | $ 3.46 |  | $ 3.46 |
Vesting period |  |  | 1 year 10 months 24 days |
Stock option expiration date |  |  | June 2008 |
Options granted to purchase of common stock to employee |  |  | 325,000 |
Options granted to purchase of common stock to board members |  |  | 10,000 |
Options granted to purchase of common stock to board members, fair value |  |  | 1,200,000 |
Number Of Equity Incentive Plan |  |  | 2 |
Number of non employee director stock option plan |  |  | 1 |
1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Stock option expiration date |  |  | June 15, 2008 |
2001 Non-Employee Director Stock Option Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Stock option expiration date |  |  | March 2011 |
Minimum [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 1 year |
Minimum [Member] | 1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 1 year |
Minimum [Member] | 2001 Non-Employee Director Stock Option Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 1 year |
Stock option expiration period |  |  | 5 years |
Minimum [Member] | 2006 Equity Incentive Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 1 year |
Maximum [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 4 years |
Maximum [Member] | 1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 4 years |
Stock option expiration period |  |  | 10 years |
Maximum [Member] | 2001 Non-Employee Director Stock Option Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 4 years |
Stock option expiration period |  |  | 7 years |
Maximum [Member] | 2006 Equity Incentive Plan [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 4 years |
Stock option expiration period |  |  | 10 years |
Stock Options [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Options outstanding, vested and expected to vest, outstanding, number | 1,934,983 |  | 1,934,983 |
Options outstanding, vested and expected to vest, aggregate intrinsic value | 0 |  | 0 |
Share-based compensation expense | $ 300,000 | $ 600,000 | $ 1,400,000 | $ 1,200,000
Warrants, Issued |  |  | 335,000 |
Weighted Average Exercise Price, Issued |  |  | $ 7.09 |
Warrant [Member] |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |
Vesting period |  |  | 18 months |
Warrants, Issued |  |  | 2,575,000 |
Weighted Average Exercise Price, Issued |  |  | $ 5.09 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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