Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers by Payor Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type	$ 251,671	$ 227,868	$ 153,616	$ 359,429	$ 294,978	$ 101,716	$ 17,265	$ 7,753	$ 992,584	$ 421,712	$ 32,528
Accounting Standards Update 2014-09
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type									992,584	421,712	32,528
Accounting Standards Update 2014-09 | Clinical Insurance Contracts
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type									555,762	257,587	705
Accounting Standards Update 2014-09 | Clinical Institutional Contracts
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type									435,688	163,083	31,284
Accounting Standards Update 2014-09 | Clinical Patient Contracts
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers by payor type									$ 1,134	$ 1,042	$ 539