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Supplemental Financial Statement Information - Schedule of Credit Risk (Details) - Customer Concentration Risk - Accounts Receivable	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Humana
Concentration Risk [Line Items]
Major customer revenue, percentage	27.00%	21.00%
UnitedHealthcare
Concentration Risk [Line Items]
Major customer revenue, percentage	24.00%	21.00%
Aetna
Concentration Risk [Line Items]
Major customer revenue, percentage	17.00%	20.00%
Centene
Concentration Risk [Line Items]
Major customer revenue, percentage	8.00%	11.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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