Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) Customer Segment	Dec. 31, 2020 USD ($) Customer	Dec. 31, 2019 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Redeemable preferred stock investment	$ 21,965,000								$ 21,965,000
Preferred stock, redemption date									Jul. 31, 2027
Unrealized holding gains									$ 2,000,000.0
Impairment losses of long-lived assets									$ 0
Number of reporting segments | Segment									1
Number of customer types | Customer									3
Gain from translations									$ 456,000	$ 20,000	$ (17,000)
Tax effects related to unrealized holding loss on available-for-sale debt securities									437,000
Tax effects related to unrealized holding gains on available-for-sale debt securities										147,000
Insurance revenue for services related to claims	251,671,000	$ 227,868,000	$ 153,616,000	$ 359,429,000	$ 294,978,000	$ 101,716,000	$ 17,265,000	$ 7,753,000	992,584,000	421,712,000	32,528,000
Contract with customer liability, revenue recognized									$ 26,400,000	257,000	$ 59,000
Practical expedient not to disclose amount of transaction price allocated to unsatisfied performance obligations									true
Stockholders Equity	$ 1,158,749,000				569,387,000				$ 1,158,749,000	569,387,000
Cumulative tax effect of accounting change									239,000
Retained Earnings (Accumulated Deficit)
Summary Of Significant Accounting Policies [Line Items]
Cumulative tax effect of accounting change									$ 239,000
ASU 2016-13
Summary Of Significant Accounting Policies [Line Items]
Accounting standards update, adopted	true								true
Accounting standards update, immaterial effect	true								true
2019-12
Summary Of Significant Accounting Policies [Line Items]
Accounting standards update, adopted	true								true
Accounting standards update, immaterial effect	true								true
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 | Retained Earnings (Accumulated Deficit)
Summary Of Significant Accounting Policies [Line Items]
Stockholders Equity	$ 887,000								$ 887,000
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 | Retained Earnings (Accumulated Deficit) | Other Long-Term Assets
Summary Of Significant Accounting Policies [Line Items]
Cumulative tax effect of accounting change									$ 239,000
Boston Molecules, Inc.
Summary Of Significant Accounting Policies [Line Items]
Equity interest percentage	25.00%								25.00%
Carrying value of equity	$ 0				$ 0				$ 0	0
Clinical Insurance Contracts | HSRA COVID-19 Uninsured Program
Summary Of Significant Accounting Policies [Line Items]
Insurance revenue for services related to claims									$ 310,400,000	$ 155,400,000
Insurance Customer
Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable from contract	47.00%				40.00%				47.00%	40.00%
Institutional Customer
Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable from contract	53.00%				60.00%				53.00%	60.00%
Customer Concentration Risk | Revenue
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer									2
Customer Concentration Risk | Revenue | Customer One
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer									1		1
Concentration risk, percentage									26.00%	28.00%	28.00%
Customer Concentration Risk | Revenue | Customer Two
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage										10.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible asset, useful life									12 years
Maximum [Member] | Computer Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets									5 years
Minimum
Summary Of Significant Accounting Policies [Line Items]
Intangible asset, useful life									5 years
Minimum | Computer Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets									3 years
Minimum | Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer									0	0
Concentration risk, percentage									10.00%	10.00%