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Stock-Based Compensation (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Sep. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2012 | Jun. 30, 2012 | Mar. 16, 2012 | Sep. 12, 2011 | Jun. 30, 2012 Stock Options [Member] | Jun. 30, 2011 Stock Options [Member] | Jun. 30, 2012 Stock Options [Member] | Jun. 30, 2011 Stock Options [Member] | Sep. 30, 2011 Warrant [Member] | Dec. 31, 2010 Warrant [Member] | Jun. 30, 2012 Warrant [Member] | Jun. 30, 2011 Warrant [Member] | Jun. 30, 2012 Warrant [Member] | Jun. 30, 2011 Warrant [Member] | Sep. 12, 2011 Warrant [Member] | Dec. 03, 2010 Warrant [Member] | Jun. 30, 2012 September 2011 Warrant [Member] | Jun. 30, 2012 September 2011 Warrant [Member] | Jun. 30, 2011 Five Year Stock Purchase Warrants [Member] | Jun. 30, 2011 Five Year Stock Purchase Warrants [Member] | Jun. 30, 2011 Three Year Stock Purchase Warrants [Member] | Jun. 30, 2012 2001 Non-Employee Director Stock Option Plan [Member] Minimum [Member] | Jun. 30, 2012 2001 Non-Employee Director Stock Option Plan [Member] Maximum [Member] | Jun. 30, 2012 1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] Minimum [Member] | Jun. 30, 2012 1998 Non Officer Stock Option Plan and Equity Incentive Plan [Member] Maximum [Member]
Stock Based Compensation (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vested and expected to vest, aggregate intrinsic value |  |  |  |  |  |  | $ 2,800,000 |  | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vested and expected to vest, outstanding, number |  |  |  |  |  |  | 1,471,200 |  | 1,471,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 4 years | 1 year | 4 years
Stock option expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 7 years |  | 10 years
Share-based compensation expense |  |  |  |  |  |  | 2,300,000 | 35,000 | 2,300,000 | 70,000 |  |  | 25,000 | 25,000 | 50,000 | 50,000 |  |  | 9,000 | 18,000 |  |  |  |  |  |  |
Warrant issued in period |  |  |  |  |  |  |  |  |  |  | 20,000 | 120,000 |  |  |  |  |  |  |  |  | 80,000 | 80,000 | 20,000 |  |  |  |
Fair value of warrants |  |  |  |  |  | 75,000 |  |  |  |  |  |  | 230,000 |  | 230,000 |  |  | 198,000 |  |  |  |  |  |  |  |  |
Common stock issuable upon exercise of warrants |  |  | 100,000 | 100,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excercise price of warrants per share |  |  | $ 3.13 | $ 3.13 |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.90 | $ 1.625 |  |  | $ 2.50 | $ 2.50 | $ 2.00 |  |  |  |
Number of approved stock option plans |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity incentive plans |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-employee director stock option plan |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted to purchase of common stock to employee |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted to purchase of common stock to members of Board |  |  | 360,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options life |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options vesting on grant date |  |  |  | 0.3333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of options following grant date |  |  |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized period of warrants | 24 months | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining vesting period of warrants |  |  |  | 22 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercised to purchase common stock one |  |  | 21,000 | 21,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercised to purchase common stock two |  |  | 2,500 | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of warrant into common stock, shares converted |  |  | 13,831 | 13,831 | 174,798 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant total excercise price |  |  | $ 7,813 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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