Revenue - Summary of Total Revenue by Type of Service (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 641,884	$ 454,053	$ 497,116
Screening services
Disaggregation of Revenue [Line Items]
Revenues	636,123	447,870	488,925
Other services
Disaggregation of Revenue [Line Items]
Revenues	$ 5,761	$ 6,183	$ 8,191