Annual report pursuant to Section 13 and 15(d)

Warrants - Narrative (Details)

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Warrants - Narrative (Details) - USD ($)
 12 Months Ended 24 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Oct. 31, 2015
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 10,352 265,484    
Unvested warrants (in shares) 0      
Warrants        
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 9,349 156,106    
Common stock        
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 10,352 265,484    
Warrants exercised by holders | Warrants        
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 5,753 127,340    
Net cash proceeds for exercise of warrants $ 12,498 $ 99,957    
Warrants exercised by holders | Used to cover exercise price        
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 3,604 51,389    
Warrants exercised by holders | Cashless basis | Common stock        
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 2,149 75,951    
Warrants exercised by holders | Cash paid | Common stock        
Class of Warrant or Right [Line Items]        
Warrants exercised (in shares) 3,596 28,766    
Warrants purchased for consulting services        
Class of Warrant or Right [Line Items]        
Warrants issued to purchase common stock (in shares)     84,000  
Exercise price (in dollars per share)     $ 6.25  
Value of warrant       $ 237,719
Expense related to vested warrant $ 0 $ 84,900