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Stock-Based Compensation (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended
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Feb. 26, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Plan | Jun. 30, 2012 | May 06, 2013 Stock Options [Member] | Mar. 19, 2013 Stock Options [Member] | Jun. 30, 2013 Stock Options [Member] | Apr. 04, 2013 Warrant [Member] | Dec. 03, 2010 Warrant [Member] | Jun. 30, 2012 Warrant [Member] | Jun. 30, 2013 Warrant [Member] | Jun. 30, 2012 Warrant [Member] | Jun. 30, 2013 Warrant [Member] Minimum [Member] | Jun. 30, 2013 Warrant [Member] Maximum [Member] | Jun. 30, 2013 1998 Non-Officer Stock Option Plan [Member] | Jun. 30, 2013 1998 Non-Officer Stock Option Plan [Member] Minimum [Member] | Jun. 30, 2013 1998 Non-Officer Stock Option Plan [Member] Maximum [Member] | Jun. 30, 2013 2006 Equity Incentive Plan [Member] | Jun. 30, 2013 2006 Equity Incentive Plan [Member] Minimum [Member] | Jun. 30, 2013 2006 Equity Incentive Plan [Member] Maximum [Member] | Jun. 30, 2013 2001 Non-Employee Director Stock Option Plan [Member] | Jun. 30, 2013 2001 Non-Employee Director Stock Option Plan [Member] Minimum [Member] | Jun. 30, 2013 2001 Non-Employee Director Stock Option Plan [Member] Maximum [Member] | Sep. 12, 2011 Three Year Stock Purchase Warrants [Member] | Jun. 30, 2013 Three Year Stock Purchase Warrants [Member] | Jun. 30, 2012 Three Year Stock Purchase Warrants [Member] | Jun. 30, 2013 Three Year Stock Purchase Warrants [Member] | Jun. 30, 2012 Three Year Stock Purchase Warrants [Member]
Stock-Based Compensation (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | June 2008 |  |  |  |  |  | March 2011 |  |  |  |  |  |  |
Options outstanding, vested and expected to vest, outstanding, number |  |  |  |  |  |  |  | 1,673,488 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vested and expected to vest, aggregate intrinsic value |  |  |  |  |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional common stock authorized for issuance as incentive stock options |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued upon exercise of warrants, value |  |  |  |  |  |  | 166,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued upon exercise of warrants, Shares |  |  |  |  |  |  | 38,456 | (38,456) |  |  |  | (1,046,211) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value related to options exercised |  |  |  |  |  |  | 58,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 4 years |  | 1 year | 4 years |  | 1 year | 4 years |  |  |  |  |
Stock option expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  | 10 years |  |  |  | 5 years | 7 years |  |  |  |  |
Warrant issued in period |  |  |  |  |  |  |  |  |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |
Exercise price of warrants per share |  |  |  |  |  |  |  |  | $ 1.00 | $ 1.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.90 |  |  |  |
Fair value of warrants |  |  |  |  |  |  |  |  |  | 198,000 |  | 166,000 |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |
Amortized period of warrants |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |
Compensation expense related to the vesting of stock options |  | 577,000 | 2,300,000 | 1,200,000 | 2,300,000 |  |  |  |  |  | 25,000 |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants granted included in product research and development expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 | 9,000 | 19,000 | 18,000
Common stock shares received on warrants exercises |  |  |  |  |  |  |  |  |  |  |  | 148,145 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional cash exercise price per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 | $ 3.13 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants |  |  |  | 200,000 | 8,000 |  |  |  | 40,000 |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercised to purchase common stock |  |  |  |  |  |  |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity incentive plans |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-employee director stock option plan |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted to purchase of common stock to employee |  |  |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options, grant date fair value |  |  |  | $ 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition period of unamortized expense related to stock options and warrants |  |  |  | 2 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock purchase due to exercise of warrant by warrant holders excluding CFO |  |  |  | 578,066 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock received due to net exercise provision of warrant | 266,228 |  |  | 412,254 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock purchase due to exercise of warrant by CFO | 320,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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