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Public Offering (Details) (USD $)
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0 Months Ended | 0 Months Ended | ||||||||
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Sep. 18, 2013
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Apr. 30, 2014
Maximum
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Aug. 16, 2013
Placement Agents
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Sep. 18, 2013
Warrants issued with September 2013 Public Offering
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Sep. 18, 2013
Warrants issued with September 2013 Public Offering
H.C. Wainwright
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Aug. 16, 2013
Warrants issued with September 2013 Public Offering
H.C. Wainwright
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Aug. 16, 2013
Warrants issued with September 2013 Public Offering
H.C. Wainwright
Maximum
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Sep. 18, 2013
Warrants issued with September 2013 Public Offering
Maxim
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Sep. 18, 2013
Warrants issued with September 2013 Public Offering
Placement Agents
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Aug. 16, 2013
Warrants issued with September 2013 Public Offering
Placement Agents
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| Shares issued in offering | 47,792,000 | |||||||||
| Aggregate number of shares of common stock the warrants can purchase | 23,896,000 | |||||||||
| Proceeds from issuance of common stock and warrants | $ 11,950,000 | |||||||||
| Net, proceeds from issuance of common stock and warrants | 11,100,000 | |||||||||
| Number of shares of common stock entitled to be purchased as a percentage of shares issued to such investor | 50.00% | |||||||||
| Exercise price of warrants (in dollars per share) | $ 1.20 | $ 0.35 | $ 0.3125 | |||||||
| Term of warrants | 4 years | |||||||||
| Placement agent and financial advisory services fees as a percentage of the offering proceeds | 6.00% | |||||||||
| Non-accountable expense allowance as a percentage of gross proceeds of offering | 1.00% | |||||||||
| Placement agent fees (as a percent) | 20.00% | |||||||||
| Percentage of warrants paid to placement agents | 5.00% | |||||||||
| Warrants issued to placement agents (in shares) | 1,911,680 | 477,920 | 2,389,600 | |||||||
| Fair value of warrants | $ 2,461,008 | $ 410,535 | ||||||||
| Dividend yield (as a percent) | 0.00% | 0.00% | ||||||||
| Volatility rate (as a percent) | 83.62% | 94.57% | ||||||||
| Risk-free interest rate (as a percent) | 1.43% | 1.43% | ||||||||