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Debt - December 2016 Convertible debt (Details)
1 Months Ended
Mar. 16, 2018
USD ($)
shares
Mar. 31, 2019
item
Jan. 31, 2019
USD ($)
shares
Aug. 31, 2018
USD ($)
shares
Jul. 31, 2017
USD ($)
Lender
Dec. 31, 2016
USD ($)
$ / shares
Lender
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 31, 2019
USD ($)
Jun. 30, 2017
USD ($)
Debt                    
Aggregate principal amount           $ 12,500,000        
Convertible promissory notes, December 2016                    
Debt                    
Aggregate principal amount           $ 2,500,000        
Number of lenders | Lender           3        
Proceeds from issuance of convertible debt           $ 2,000,000        
Unamortized note discount           $ 500,000        
Conversion price (in dollars per share) | $ / shares           $ 64.75        
Revised principal value of debt                   $ 2,625,338
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        
Interest Payable $ 534,775     $ 479,808            
Debt legal fee $ 169,950                  
Repayment of accrued interest     $ 446,729              
Shares issued (in shares) | shares 4,081   19,751 4,582            
Number of debt instrument extinguished | item   2                
Convertible promissory notes, December 2016 | Convertible Long-term Debt                    
Debt                    
Unamortized balance of notes payable             $ 0 $ 0    
Convertible note purchase agreement                    
Debt                    
Debt instrument, frequency of periodic payment         P6M          
Accrued interest capitalized to principal of debt                   $ 125,338
Convertible promissory notes, July 2017                    
Debt                    
Aggregate principal amount         $ 7,500,000          
Number of lenders | Lender         4          
Proceeds from issuance of convertible debt         $ 6,000,000          
Unamortized note discount         $ 1,500,000          
Interest rate (as a percent)         10.00%          
Napo December 2016 and Napo July 2017 Notes                    
Debt                    
Aggregate principal amount                 $ 10,125,339  
2019 Exchange Note 1                    
Debt                    
Aggregate principal amount                 $ 10,125,000  
Interest rate (as a percent)                 10.00%  
2019 Exchange Note 2                    
Debt                    
Aggregate principal amount                 $ 2,297,000  
Interest rate (as a percent)                 10.00%  
Napo | Convertible promissory notes, December 2016                    
Debt                    
Carrying amount of Notes issued                 $ 10,375,326  
Napo | Napo December 2016 and Napo July 2017 Notes                    
Debt                    
Aggregate principal amount                 10,125,339  
Unamortized premium                 249,987  
Napo | 2019 Exchange Note 1                    
Debt                    
Aggregate principal amount                 10,535,900  
Accrued interest capitalized to principal of debt                 $ 410,562