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Stock Based Compensation (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Plans | Sep. 30, 2013 | Sep. 30, 2014 Minimum [Member] 1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] | Sep. 30, 2014 Minimum [Member] 2001 Non-Employee Director Stock Option Plan [Member] | Sep. 30, 2014 Minimum [Member] 2006 Equity Incentive Plan [Member] | Sep. 30, 2014 Maximum [Member] 1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] | Sep. 30, 2014 Maximum [Member] 2001 Non-Employee Director Stock Option Plan [Member] | Sep. 30, 2014 Maximum [Member] 2006 Equity Incentive Plan [Member] | Sep. 30, 2014 Stock Options [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2014 Stock Options [Member] | Sep. 30, 2013 Stock Options [Member] | May 31, 2014 May 2014 Investor Warrant [Member] | May 31, 2014 May 2014 Agent Warrant [Member]
Stock-Based Compensation (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vested and expected to vest, outstanding, number |  |  |  |  |  |  |  |  |  |  | 1,823,089 |  | 1,823,089 |  |  |
Options outstanding, vested and expected to vest, aggregate intrinsic value |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |
Share-based compensation expense | 179,000 | 762,000 | 1,594,000 | 2,101,000 |  |  |  |  |  |  | 200,000 | 1,600,000 | 700,000 | 1,900,000 |  |
Weighted average grant date fair value |  |  |  |  |  |  |  |  |  |  | $ 3.35 |  | $ 3.35 |  |  |
Vesting period |  |  | 1 year 10 months 24 days |  | 1 year | 1 year | 1 year | 4 years | 4 years | 4 years |  |  |  |  |  |
Stock option expiration period |  |  |  |  |  | 5 years |  | 10 years | 7 years | 10 years |  |  |  |  |  |
Options granted to purchase of common stock to employee |  |  |  |  |  |  |  |  |  |  |  |  | 355,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, Issued |  |  |  |  |  |  |  |  |  |  |  |  | 365,000 |  | 2,500,000 |
Weighted Average Exercise Price, Issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.77 |  | $ 5.09 |
Gross proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,725,000 |
Placement agent fee |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |
Shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000

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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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