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Debt - Bpifrance Reimbursable Advance (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Debt                  
Repayment of debt | $         $ 134,000 $ 125,000      
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          
Reimbursement annuity (percent)   20.00%              
Repayment of debt | $   $ 44,000 $ 41,000   $ 134,000 $ 125,000      
Balance outstanding       € 400,000     $ 400,000