Quarterly report pursuant to Section 13 or 15(d)

Notes Payable (Narrative) (Details)

v3.20.2
Notes Payable (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Mar. 29, 2019
USD ($)
installment
item
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
Debt Instrument [Line Items]              
Total amount available   $ 20,000,000.0          
Amortization of debt discount     $ 1,800,000 $ 300,000 $ 2,300,000 $ 500,000  
Horizon Notes [Member]              
Debt Instrument [Line Items]              
Total amount available   20,000,000.0          
Proceeds from Horizon Notes   15,000,000.0          
Remaining amount fundable   $ 5,000,000.0          
Maturity of each advance   42 months          
Number of advances | item   3          
Base interest rate (as a percent) 9.00%   9.00%   9.00%   9.00%
Variable interest rate floor (as a percent)   2.50%     2.50%    
Number of monthly installments | installment   18          
Final payment fee $ 750,000   $ 750,000   $ 750,000    
Accrued interest 112,500   112,500   112,500    
Debt instrument face value 15,000,000.0   $ 15,000,000.0   $ 15,000,000.0    
Prepayment penalties $ 550,000            
Horizon Notes [Member] | LIBOR Rate [Member]              
Debt Instrument [Line Items]              
Base interest rate (as a percent) 9.00% 9.00% 9.00%   9.00%