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Summary of Significant Accounting Policies - Schedule of Revenues by Geographic Region (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation Of Revenue [Line Items]        
Revenues $ 1,366 $ 7,421 $ 17,946 $ 14,589
Netherlands        
Disaggregation Of Revenue [Line Items]        
Revenues 64 255 724 504
Switzerland        
Disaggregation Of Revenue [Line Items]        
Revenues 1,290 7,215 17,190 14,174
United States        
Disaggregation Of Revenue [Line Items]        
Revenues $ 12 $ (49) $ 32 $ (89)