Quarterly report pursuant to Section 13 or 15(d)

Deerfield Obligation - Narrative (Details)

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Deerfield Obligation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 28 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Oct. 31, 2020
Jan. 31, 2021
Nov. 01, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Interest expense, net $ (205,938) $ (234,854) $ (613,624) $ (577,664)        
Long-term debt, current portion 1,050,000   1,050,000         $ 1,050,000
Deerfield Obligation                
Debt Instrument [Line Items]                
Interest expense, net 200,000   700,000          
Deerfield Obligation 15,300,000   15,300,000          
Long-term debt, current portion $ 1,100,000   $ 1,100,000          
Forecast | Deerfield Obligation                
Debt Instrument [Line Items]                
Periodic payment         $ 262,500      
Balloon payment to be paid           $ 15,250,000    
Subsequent Event | Deerfield CSF | Payment Guarantee                
Debt Instrument [Line Items]                
Guarantor obligation             $ 25,700,000