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Debt - Bpifrance Reimbursable Advance (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2017
EUR (€)
Debt              
Reimbursement annuity (percent)   20.00% 20.00%        
Repayment of debt | $   $ 0   $ 45,000      
Bpifrance | Subsequent Event              
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 | $   0   $ 45,000      
Balance outstanding   $ 400,000       € 300,000