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Related Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 01, 2017
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]            
Due from related parties   $ 349   $ 289 $ 204  
Due to related parties   797   1,425 1,782  
Affiliated Entities            
Related Party Transaction [Line Items]            
Commitment to receive future capital contributions $ 55,000          
Due from related parties   300   300 200  
Related party costs   2,075 $ 2,769 11,584 11,311 $ 13,254
Affiliated Entities | Contribution Agreement            
Related Party Transaction [Line Items]            
Dividend rate 3.00%          
Commitment to receive future capital contributions $ 55,000          
Cumulative funding drawn         55,000  
Affiliated Entities | TSA Agreement            
Related Party Transaction [Line Items]            
Related party costs   1,400 1,900 7,200 7,800 6,000
Due to related parties   700   600 500  
Affiliated Entities | Service Agreements            
Related Party Transaction [Line Items]            
Related party costs   700 900 4,400 3,500 7,300
Due to related parties   0   800 1,300  
Affiliated Entities | Diagnostic test revenue            
Related Party Transaction [Line Items]            
Revenue from related parties   $ 0 $ 100 $ 300 0 0
Affiliated Entities | Other            
Related Party Transaction [Line Items]            
Revenue from related parties         $ 1,200 $ 300