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Financing Instruments - Note Purchase Agreements - Chairman of the Board Commitment (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 30, 2016
Dec. 21, 2015
Nov. 12, 2015
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 10, 2013
Debt Instrument [Line Items]              
Repayments of related party debt         $ 500,000 $ 0  
Board of Directors Chairman [Member]              
Debt Instrument [Line Items]              
Granted     500,000        
Share price (in USD per share)     $ 0.294        
Term of stock option acquisition rights (years)     8 years        
Grant-date fair value of option awards     $ 47,121        
Repayments of related party debt   $ 500,000   $ 500,000      
Repurchase of principal   $ 150,000   $ 150,000 $ 150,000    
Secured Debt [Member] | Note Purchase Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity             $ 7,200,000.0
Scenario, Forecast [Member]              
Debt Instrument [Line Items]              
Repayments of debt $ 2,000,000