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Warrants to Purchase Common Stock (Details Textual) (USD $)
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1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||
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Aug. 31, 2012
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Apr. 30, 2012
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Dec. 31, 2012
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Oct. 05, 2012
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Aug. 16, 2012
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Dec. 31, 2011
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Dec. 31, 2012
National Securities Corporation [Member]
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Sep. 30, 2011
National Securities Corporation [Member]
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Dec. 31, 2012
Debt Placement Agent Warrants [Member]
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Apr. 26, 2010
Debt Placement Agent Warrants [Member]
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Apr. 26, 2010
Debt Placement Agent Warrants [Member]
Series A [Member]
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Apr. 26, 2010
Debt Placement Agent Warrants [Member]
2008 Senior Convertible Notes [Member]
Series A [Member]
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Apr. 26, 2010
Debt Placement Agent Warrants [Member]
2009 Senior Convertible Notes [Member]
Series A [Member]
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Dec. 31, 2012
PCP Warrants [Member]
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Dec. 31, 2009
PCP Warrants [Member]
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Dec. 31, 2011
PCP Warrants [Member]
Series A [Member]
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Apr. 26, 2010
PCP Warrants [Member]
Series A [Member]
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Dec. 31, 2012
Preferred Stock Placement Warrants [Member]
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Dec. 31, 2012
Preferred Stock Placement Warrants [Member]
Series A [Member]
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Dec. 31, 2012
Preferred Stock Placement Warrants [Member]
Maximum [Member]
Series A [Member]
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Dec. 31, 2012
Preferred Stock Placement Warrants [Member]
Minimum [Member]
Series A [Member]
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Dec. 31, 2012
Non-employee warrants [Member]
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Aug. 31, 2012
Non-employee warrants [Member]
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Apr. 30, 2012
Non-employee warrants [Member]
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Dec. 31, 2011
Non-employee warrants [Member]
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Sep. 30, 2011
Non-employee warrants [Member]
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Mar. 31, 2011
Non-employee warrants [Member]
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Feb. 28, 2011
Non-employee warrants [Member]
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Nov. 30, 2010
Non-employee warrants [Member]
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Dec. 18, 2012
Non-employee warrants [Member]
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Aug. 28, 2012
Non-employee warrants [Member]
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Aug. 16, 2012
Non-employee warrants [Member]
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Apr. 02, 2012
Non-employee warrants [Member]
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Nov. 22, 2010
Non-employee warrants [Member]
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Sep. 30, 2011
Non-employee warrants [Member]
Maximum [Member]
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Sep. 30, 2011
Non-employee warrants [Member]
Minimum [Member]
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Apr. 02, 2012
Warrants to Purchase Series C Shares [Member]
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Dec. 31, 2012
Warrants to Purchase Series C Shares [Member]
Common Stock [Member]
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Apr. 02, 2012
Warrants to Purchase Series C Shares [Member]
Common Stock [Member]
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Nov. 15, 2011
Warrants to Purchase Series C Shares [Member]
Common Stock [Member]
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| Warrants to Purchase Common Stock (Textual) [Abstract] | ||||||||||||||||||||||||||||||||||||||||
| Period of Issued Warrants | 7 years | 5 years | 7 years | 10 years | 5 years | 5 years | ||||||||||||||||||||||||||||||||||
| Notes Principal Amount Percentage | 10.00% | 10.00% | 40.00% | 40.00% | ||||||||||||||||||||||||||||||||||||
| Warrant exercise price | 5.72 | 5.59 | 1.00 | 9.23 | 9.23 | 1.00 | 6.15 | 9.23 | 8.39 | 6.00 | 2.95 | 1.37 | 1.37 | 4.88 | 5.65 | 5.72 | 1.37 | 9.23 | ||||||||||||||||||||||
| Issued warrants to purchase common stock | 20,000 | 461,263 | 48,510 | 41,716 | 40,787 | 27,175 | 258,421 | 5,000 | 75,000 | 60,000 | 50,000 | 35,000 | 73,009 | 25,000 | 25,000 | 41,716 | ||||||||||||||||||||||||
| Fair value of the warrant | $ 92,000 | $ 200,000 | $ 100,000 | $ 100,000 | $ 47,000 | $ 600,000 | $ 19,100 | $ 144,000 | $ 98,000 | $ 69,000 | $ 103,000 | $ 113,000 | $ 38,000 | |||||||||||||||||||||||||||
| Exercise price percentage | 110.00% | 110.00% | ||||||||||||||||||||||||||||||||||||||
| Volatility | 104.51% | 94.40% | 92.00% | 97.45% | 110.30% | 91.10% | 95.40% | 93.20% | 93.70% | 96.30% | 90.80% | 92.40% | ||||||||||||||||||||||||||||
| Risk free rate | 1.06% | 3.30% | 2.00% | 0.28% | 0.83% | 0.40% | 3.58% | 2.65% | 1.40% | 0.90% | 0.40% | 0.93% | ||||||||||||||||||||||||||||
| Contractual term | 6 years | 7 years | 3 years | 5 years | 3 years | 10 years | 5 years | 5 years | 5 years | 3 years | 5 years | |||||||||||||||||||||||||||||
| Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | |||||||||||||||||||||||||||||||||
| Estimated per share fair value | $ 3.45 | $ 1.96 | $ 8.00 | |||||||||||||||||||||||||||||||||||||
| Warrants Expiration Terms | The warrant expires on the sixth anniversary of its issuance date | The warrant expires on the third anniversary of its issuance date | The warrant expires on the fifth anniversary of its issuance date | The warrants expire on the third anniversary of its issuance date | The warrants expire on the third or fifth anniversaries of their issuance dates. | |||||||||||||||||||||||||||||||||||
| Warrants issued | 20,970 | |||||||||||||||||||||||||||||||||||||||
| Warrant fair value | $ 8.50 | |||||||||||||||||||||||||||||||||||||||
| Warrant vest | 2 years | 2 years | 6 months | |||||||||||||||||||||||||||||||||||||
| Fee paid to National Securities Corporation as consideration for its services as the placement agent | 10.00% | |||||||||||||||||||||||||||||||||||||||
| Common Stock, shares issued | 24,400,754 | 3,361 | 18,604,245 | 534 | ||||||||||||||||||||||||||||||||||||
| Gross proceeds of the issuance in connection with the Company's Series C Share offering | 2,600,000 | |||||||||||||||||||||||||||||||||||||||
| Duration of issued warrant | 5 years | |||||||||||||||||||||||||||||||||||||||
| Fair value of warrants reduction in carrying amount in share | 1,300,000 | |||||||||||||||||||||||||||||||||||||||
| Amount charge due to mark-to-market valuation of warrants exercisable for common stock | 1,400,000 | |||||||||||||||||||||||||||||||||||||||
| Final fair value of common stock | $ 2,700,000 | |||||||||||||||||||||||||||||||||||||||
| Common stock shares exercised | 2,986 | |||||||||||||||||||||||||||||||||||||||
| Fair market value of common stock on the date of exercise | $ 6.81 | |||||||||||||||||||||||||||||||||||||||
| Exercise price of the warrants | $ 5.59 | |||||||||||||||||||||||||||||||||||||||