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Private Placements and Public Offerings (Details) (USD $)
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0 Months Ended | 1 Months Ended | 5 Months Ended | 8 Months Ended | 12 Months Ended | 66 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||||||
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Jun. 24, 2011
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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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Dec. 18, 2012
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Mar. 28, 2012
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Mar. 18, 2011
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Jul. 31, 2013
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Jul. 31, 2012
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Jul. 31, 2013
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Dec. 12, 2012
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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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Jul. 31, 2013
Maximum
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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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Jul. 31, 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. 18, 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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Jul. 31, 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 | 1,456,000 | |||||||||||||||||||||||||||||||||||||
| Shares issued in offering | 28,800,000 | 31,000,000 | 4,000,000 | |||||||||||||||||||||||||||||||||||
| Aggregate number of shares of common stock the warrants can purchase | 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 | |||||||||||||||||||||||||||||||||||||
| Gross proceeds from private placement | $ 3,000,000 | $ 1,092,000 | ||||||||||||||||||||||||||||||||||||
| 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 | $ 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% | 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 issuance of common stock and warrants | 7,200,000 | 7,750,000 | ||||||||||||||||||||||||||||||||||||
| Net, proceeds from issuance of common stock and warrants | $ 6,700,000 | $ 7,200,000 | ||||||||||||||||||||||||||||||||||||
| Non-accountable expense allowance as a percentage of gross proceeds of offering | 1.00% | 1.00% | ||||||||||||||||||||||||||||||||||||