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Debt - March 2017 Convertible debt (Details)
Mar. 31, 2017
USD ($)
tranche
Lender
Feb. 28, 2015
USD ($)
Debt and Warrants    
Principal amount   $ 150,000
Exchangeable note purchase agreement | Napo    
Debt and Warrants    
Number of lenders, agreement | Lender 2  
Principal amount $ 1,312,500  
Number of tranches | tranche 2  
Value of each tranche $ 525,000  
Face amount of each tranche $ 656,250  
Interest rate (as a percent) 3.00%  
Fair value of notes $ 1,312,500