Private Placements and Public Offerings (Details) (USD $)
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0 Months Ended | 1 Months Ended | 5 Months Ended | 8 Months Ended | 9 Months Ended | 63 Months Ended | 1 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||||||||||
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Dec. 17, 2012
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Dec. 31, 2012
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Mar. 31, 2012
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Jun. 30, 2011
item
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Mar. 31, 2011
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Dec. 31, 2012
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Mar. 28, 2012
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Apr. 30, 2013
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Apr. 30, 2012
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Apr. 30, 2013
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Dec. 12, 2012
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Jul. 31, 2012
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Jun. 24, 2011
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Mar. 18, 2011
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Mar. 02, 2011
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Feb. 28, 2011
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Mar. 31, 2012
Rodman
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Mar. 31, 2012
Roth
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Mar. 31, 2012
Placement Agents
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Mar. 28, 2012
Placement Agents
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Jun. 30, 2011
Maximum
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Apr. 30, 2013
Maximum
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Jun. 24, 2011
Warrants issued with March 2011 Private Placement
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Jun. 30, 2011
Warrants issued with March 2011 Private Placement
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Mar. 31, 2011
Warrants issued with March 2011 Private Placement
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Mar. 18, 2011
Warrants issued with March 2011 Private Placement
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Jun. 30, 2011
Series A Warrant
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Jun. 24, 2011
Series A Warrant
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Jun. 30, 2011
Series B Warrant
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Jun. 24, 2011
Series B Warrant
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Jun. 24, 2011
Series C Warrant
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Mar. 31, 2012
Warrants issued with March 2012 Public Offering
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Apr. 30, 2013
Warrants issued with March 2012 Public Offering
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Mar. 28, 2012
Warrants issued with March 2012 Public Offering
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Dec. 17, 2012
Warrants issued with December 2012 Public Offering
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Dec. 31, 2012
Warrants issued with December 2012 Public Offering
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Dec. 30, 2012
Warrants issued with December 2012 Public Offering
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Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Placement Agents
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Apr. 30, 2013
Warrants issued with December 2012 Public Offering
Placement Agents
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Dec. 30, 2012
Warrants issued with December 2012 Public Offering
Placement Agents
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Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Dawson
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Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Noble and Burrill
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Dec. 31, 2012
Warrants issued with December 2012 Public Offering
Maximum
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Number of units issued under private placement | 4,000,000 | 1,456,000 | |||||||||||||||||||||||||||||||||||||||||
Shares issued in offering | 28,800,000 | 31,000,000 | 31,000,000 | 14,400,000 | |||||||||||||||||||||||||||||||||||||||
Purchase price of units issued under private placement (in dollars per unit) | $ 0.75 | ||||||||||||||||||||||||||||||||||||||||||
Common stock, purchase price (in dollars per share) | $ 0.75 | ||||||||||||||||||||||||||||||||||||||||||
Proceeds from private placement | $ 3,000,000 | $ 1,092,000 | $ 3,000,000 | ||||||||||||||||||||||||||||||||||||||||
Composition of private placement unit, number of shares of common stock | 1 | ||||||||||||||||||||||||||||||||||||||||||
Composition of private placement unit, number of warrants to purchase common stock | 1 | ||||||||||||||||||||||||||||||||||||||||||
Number of common shares that can be acquired upon exercise of each whole warrant | 1 | ||||||||||||||||||||||||||||||||||||||||||
Exercise price of warrants (in dollars per share) | $ 0.26 | $ 0.3125 | $ 1.20 | $ 1.00 | $ 1.20 | $ 0.75 | $ 1.20 | $ 0.35 | $ 0.3125 | ||||||||||||||||||||||||||||||||||
Term of warrants | 5 years | 5 years | 5 years | 5 years | 4 years | ||||||||||||||||||||||||||||||||||||||
Fair value of warrants | 276,980 | 431,981 | 3,206,486 | 2,151,360 | 228,240 | ||||||||||||||||||||||||||||||||||||||
Dividend yield (as a percent) | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | ||||||||||||||||||||||||||||||||||||||
Volatility rate (as a percent) | 125.00% | 89.68% | 125.00% | 96.66% | 98.09% | ||||||||||||||||||||||||||||||||||||||
Risk-free interest rate (as a percent) | 1.05% | 2.11% | 1.05% | 0.56% | 0.74% | ||||||||||||||||||||||||||||||||||||||
Number of series of warrants | 3 | ||||||||||||||||||||||||||||||||||||||||||
Number of common shares that can be acquired upon exercise of warrants | 12,000,000 | ||||||||||||||||||||||||||||||||||||||||||
Aggregate net proceeds from sale of common stock and Warrants | 2,790,000 | ||||||||||||||||||||||||||||||||||||||||||
Number of shares of common stock entitled to be purchased as a percentage of shares issued to such investor | 100.00% | 100.00% | 50.00% | ||||||||||||||||||||||||||||||||||||||||
Period from date of closing for filing registration statement under Registration Rights Agreement | 30 days | ||||||||||||||||||||||||||||||||||||||||||
Penalty for non-compliance of Registration Rights Agreement as a percentage of aggregate net proceeds of private placement | 9.00% | ||||||||||||||||||||||||||||||||||||||||||
Placement agent fees as a percentage of offering proceeds | 6.00% | 6.00% | 6.00% | ||||||||||||||||||||||||||||||||||||||||
Placement agent fees | 180,000 | ||||||||||||||||||||||||||||||||||||||||||
Reimbursement of expenses to lead placement agent | 30,000 | ||||||||||||||||||||||||||||||||||||||||||
Total cash fees paid to placement agents | 210,000 | 504,000 | 542,500 | 504,000 | 542,500 | 1,046,500 | |||||||||||||||||||||||||||||||||||||
Percentage of placement agent warrants paid to Roth Capital Partners, LLC | 5.00% | 6.00% | 30.00% | 50.00% | 5.00% | ||||||||||||||||||||||||||||||||||||||
Warrants issued to placement agents (in shares) | 1,440,000 | 1,550,000 | 240,000 | 1,085,000 | 465,000 | 720,000 | 360,000 | ||||||||||||||||||||||||||||||||||||
Par value of shares shown as a reduction to paid-in capital | 400 | ||||||||||||||||||||||||||||||||||||||||||
Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001 | $ 0.0001 | $ 0.0001 | $ 0.001 | |||||||||||||||||||||||||||||||||||||
Proceeds from offering | 7,200,000 | 7,750,000 | |||||||||||||||||||||||||||||||||||||||||
Proceeds from public offering, net of offering costs | $ 6,700,000 | $ 7,200,000 | |||||||||||||||||||||||||||||||||||||||||
Non-accountable expense allowance as a percentage of gross proceeds of offering | 1.00% | 1.00% |