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Debt - Bpifrance Reimbursable Advance (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2020
Dec. 31, 2017
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
EUR (€)
Dec. 31, 2017
EUR (€)
Debt                  
Reimbursement annuity (percent)         20.00% 20.00%      
Repayment of debt | $         $ 53,000   $ 134,000    
Bpifrance                  
Debt                  
Principal payment deferral period 6 months                
Alize | Bpifrance                  
Debt                  
Assumed debt outstanding | €                 € 700,000
Original advance amount | €                 € 800,000
Interest charged under the advance | $   $ 0              
Interest accrued under the advance | $   $ 0              
Quarterly principal payments | €           € 17,500      
Final principal payments | €               € 50,000  
Repayment of debt | $     $ 53,000 $ 44,000 53,000   $ 134,000    
Balance outstanding     $ 300,000   $ 300,000     € 300,000