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Revenue - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues [Abstract]                      
Revenue $ 100,301 $ 98,928 $ 64,605 $ 81,024 $ 65,122 $ 61,196 $ 56,168 $ 47,197 $ 344,858 $ 229,683 $ 105,400
Fertility benefit services revenue                      
Revenues [Abstract]                      
Revenue                 253,556 189,618 99,786
Pharmacy benefit services revenue                      
Revenues [Abstract]                      
Revenue                 $ 91,302 $ 40,065 $ 5,614