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Debt and Warrants - December 2016 Convertible Notes (Details) - Napo
1 Months Ended
Mar. 16, 2018
USD ($)
shares
Jul. 31, 2017
USD ($)
Lender
Dec. 31, 2016
USD ($)
$ / shares
Lender
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 16, 2017
USD ($)
December 2016 Convertible Notes              
Debt and Warrants              
Notes payable     $ 2,500,000        
Number of lenders | Lender     3        
Proceeds from issuance of convertible debt   $ 6,000,000 $ 2,000,000        
Unamortized note discount     $ 500,000        
Revised principal value of debt           $ 2,625,338  
Annual percentage of conversion     0.33%        
Conversion price (in dollars per share) | $ / shares     $ 0.925        
Fair value of notes     $ 11,161,000        
Difference between the fair value of the notes and the principal balance     $ 1,035,661        
Amortization period of such difference amount     29 months        
Contra interest expenses     $ 178,562        
Interest Payable             $ 534,775
Debt legal fee $ 169,950            
Shares issued (in shares) | shares 4,285,423            
December 2016 Convertible Notes | Convertible Long-term Debt              
Debt and Warrants              
Unamortized balance of notes payable       $ 10,661,026 $ 10,982,438    
Convertible note purchase agreement              
Debt and Warrants              
Notes payable     $ 12,500,000        
Interest rate (as a percent)   10.00%          
Debt instrument, frequency of periodic payment   six-month          
Accrued interest capitalized to principal of debt           $ 125,338  
Convertible promissory notes, July 2017              
Debt and Warrants              
Notes payable   $ 7,500,000          
Number of lenders | Lender   4          
Unamortized note discount   $ 1,500,000