Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers by Payor Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type	$ 227,868	$ 101,716	$ 740,913	$ 126,734
Accounting Standards Update 2014-09
Disaggregation Of Revenue [Line Items]
Type of Revenue [Extensible Enumeration]	us-gaap:ServiceOtherMember	us-gaap:ServiceOtherMember	us-gaap:ServiceOtherMember	us-gaap:ServiceOtherMember
Revenue from contracts with customers by payor type	$ 227,868	$ 101,716	$ 740,913	$ 126,734
Clinical Institutional Contracts | Accounting Standards Update 2014-09
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type	84,401	34,527	339,572	58,459
Clinical Patient Contracts | Accounting Standards Update 2014-09
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type	191	1,078	987	1,339
Clinical Insurance Contracts | Accounting Standards Update 2014-09
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type	$ 143,276	$ 66,111	$ 400,354	$ 66,936