Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Aspire Capital Transaction (Details)

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Capital Structure - Aspire Capital Transaction (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 08, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]        
Number of shares sold under purchase agreement   10,901,165   9,434,141
Proceeds from sale of stock   $ 1,186,564 $ 0  
Aspire Capital | Common Stock Purchase Agreement        
Class of Stock [Line Items]        
Maximum value of common stock purchases committed to by counterparty $ 15,000,000.0      
Term of the common stock purchase agreement 30 months      
Threshold price per common stock on any trading day to present notice for purchase of common stock (usd per share) $ 0.50      
Number of shares sold under purchase agreement 250,000 965,165   763,998
Price per share (usd per share) $ 4.00      
Gross proceeds $ 1,000,000 $ 789,000    
Number of shares of common stock issued as commitment fee 175,000      
Proceeds from sale of stock       $ 1,900,000
Aspire Capital | Common Stock Purchase Agreement | Maximum        
Class of Stock [Line Items]        
Number of common stock issued per day on achieving threshold price per common stock (in shares) 50,000