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Employees and Employee-Related Costs - Number of employees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number and average number of employees [abstract]      
Average number of full-time employees 33 25 18
Number of employees, including consultants, by country at end of period: 35 31 20
Denmark and United States      
Number and average number of employees [abstract]      
Number of employees, including consultants, by country at end of period: 35 31 20