Revenue - Summary of Total Revenue by Type of Service (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 205,591	$ 159,328	$ 397,563	$ 298,698
Screening services
Disaggregation of Revenue [Line Items]
Revenues	204,282	158,183	394,030	295,392
Other services
Disaggregation of Revenue [Line Items]
Revenues	$ 1,309	$ 1,145	$ 3,533	$ 3,306

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details