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Financing Instruments - Note Purchase Agreements - Chairman of the Board Commitment (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 07, 2016
Apr. 30, 2016
Apr. 21, 2016
Mar. 14, 2016
Dec. 21, 2015
Nov. 12, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 10, 2013
Debt Instrument [Line Items]                      
Repayments of debt     $ 2,000,000                
Repayments of related party debt                 $ 0 $ 500,000  
Board of Directors Chairman [Member]                      
Debt Instrument [Line Items]                      
Granted             500,000        
Share price (in USD per share)         $ 0.40   $ 0.294        
Term of stock option acquisition rights (years)         3 years   8 years        
Grant-date fair value of option awards             $ 47,000        
Repayments of related party debt $ 150,000         $ 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
Repayments of debt   $ 5,800,000   $ 1,900,000