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Private Placements and Public Offerings (Details) (USD $)
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0 Months Ended | 2 Months Ended | 5 Months Ended | 8 Months Ended | 10 Months Ended | 12 Months Ended | 78 Months Ended | 0 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||||||||||||||||||||||||||
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Jun. 06, 2014
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Sep. 18, 2013
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Dec. 17, 2012
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Mar. 28, 2012
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Jun. 24, 2011
item
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Sep. 17, 2013
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Dec. 17, 2012
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Mar. 28, 2012
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Mar. 18, 2011
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Jun. 06, 2014
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Jul. 31, 2014
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Jul. 31, 2013
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Jul. 31, 2012
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Jul. 31, 2014
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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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Jun. 24, 2011
Maximum
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Jul. 31, 2014
Maximum
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Mar. 18, 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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Jun. 24, 2011
Series A 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. 28, 2012
Warrants issued with March 2012 Public Offering
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Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Rodman
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Jan. 23, 2012
Warrants issued with March 2012 Public Offering
Rodman
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Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Roth
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Mar. 28, 2012
Warrants issued with March 2012 Public Offering
Placement Agents
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Dec. 17, 2012
Warrants issued with December 2012 Public Offering
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Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Placement Agents
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Jul. 31, 2014
Warrants issued with December 2012 Public Offering
Placement Agents
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Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Dawson
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Nov. 16, 2012
Warrants issued with December 2012 Public Offering
Dawson
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Dec. 17, 2012
Warrants issued with December 2012 Public Offering
Noble and Burrill
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Dec. 17, 2013
Warrants issued with December 2012 Public Offering
Maximum
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Sep. 18, 2013
Warrants issued with September 2013 Public Offering
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Aug. 16, 2013
Warrants issued with September 2013 Public Offering
Placement Agents
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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
Maxim
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Jun. 06, 2014
Warrants issued with June 2014 Public Offering
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Jun. 06, 2014
Warrants issued with June 2014 Public Offering
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Jun. 03, 2014
Warrants issued with June 2014 Public Offering
Placement Agents
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Jun. 03, 2014
Warrants issued with June 2014 Public Offering
Noble
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Jun. 03, 2014
Warrants issued with June 2014 Public Offering
H.C. Wainwright
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Jun. 03, 2014
Warrants issued with June 2014 Public Offering
Maxim
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| Private Placements and Public Offerings | ||||||||||||||||||||||||||||||||||||||||||||||
| Number of units issued under private placement | 1,456,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Shares issued in offering | 22,536,212 | 47,792,000 | 28,800,000 | 31,000,000 | 4,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Aggregate number of shares of common stock the warrants can purchase | 12,000,000 | 37,647,790 | 37,647,790 | 31,000,000 | 14,400,000 | 23,896,000 | 7,887,325 | |||||||||||||||||||||||||||||||||||||||
| 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 | $ 1.20 | $ 1.00 | $ 1.20 | $ 0.75 | $ 1.20 | $ 0.35 | $ 0.3125 | $ 0.3125 | $ 0.35 | $ 0.3125 | |||||||||||||||||||||||||||||||||||
| Term of warrants | 5 years | 5 years | 5 years | 5 years | 4 years | 4 years | ||||||||||||||||||||||||||||||||||||||||
| Fair value of warrants | 431,981 | 3,206,486 | 276,980 | 2,151,360 | 228,240 | 2,461,008 | 410,535 | 2,756,979 | 631,707 | |||||||||||||||||||||||||||||||||||||
| Dividend yield (as a percent) | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | |||||||||||||||||||||||||||||||||||||
| Volatility rate (as a percent) | 89.68% | 125.00% | 125.00% | 96.66% | 98.09% | 83.62% | 94.57% | 90.30% | 90.30% | |||||||||||||||||||||||||||||||||||||
| Risk-free interest rate (as a percent) | 2.11% | 1.05% | 1.05% | 0.56% | 0.74% | 1.43% | 1.43% | 1.53% | 1.53% | |||||||||||||||||||||||||||||||||||||
| Number of series of warrants | 3 | |||||||||||||||||||||||||||||||||||||||||||||
| 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% | 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% | 6.00% | 6.00% | |||||||||||||||||||||||||||||||||||||||||
| Placement agent fees | 180,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Reimbursement of expenses to lead placement agent | 30,000 | 25,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Total cash fees paid to placement agents | 210,000 | 836,360 | 504,000 | 542,500 | 1,145,000 | 1,981,360 | 504,000 | 542,500 | 3,027,860 | |||||||||||||||||||||||||||||||||||||
| Percentage of warrants paid to placement agents | 5.00% | 5.00% | 6.00% | 30.00% | 50.00% | 5.00% | 20.00% | 45.00% | 22.50% | 6.00% | 22.50% | |||||||||||||||||||||||||||||||||||
| Placement agent fees (as a percent) | 5.00% | 45.00% | 22.50% | 22.50% | ||||||||||||||||||||||||||||||||||||||||||
| Warrants issued to placement agents (in shares) | 2,389,600 | 1,440,000 | 1,550,000 | 240,000 | 1,085,000 | 465,000 | 720,000 | 360,000 | 1,911,680 | 477,920 | ||||||||||||||||||||||||||||||||||||
| 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 | 11,950,000 | 16,000,000 | ||||||||||||||||||||||||||||||||||||||||||
| Net, proceeds from issuance of common stock and warrants | $ 6,700,000 | $ 7,200,000 | $ 11,100,000 | $ 14,900,000 | ||||||||||||||||||||||||||||||||||||||||||
| Non-accountable expense allowance as a percentage of gross proceeds of offering | 1.00% | 1.00% | 1.00% | 1.00% | ||||||||||||||||||||||||||||||||||||||||||