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Revenue - Revenue by geography (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 1,809 $ 860
United States    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
Latin America    
Disaggregation of Revenue [Line Items]    
Revenue $ 1,809 $ 860