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Revenue and Accounts Receivable Credit Concentration - Summary of Revenue and Accounts Receivable by Third-party Payors and Other Customers (Details) - Customer Concentration Risk - Minimum	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue | The Big Ten Conference
Concentration Risk [Line Items]
Concentration risk, percentage	40.00%	30.00%
Revenue | Centura Healthcare
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%	17.00%
Revenue | Medicare
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%	17.00%
Accounts Receivable | The Big Ten Conference
Concentration Risk [Line Items]
Concentration risk, percentage		35.00%
Accounts Receivable | Centura Healthcare
Concentration Risk [Line Items]
Concentration risk, percentage		24.00%
Accounts Receivable | Medicare
Concentration Risk [Line Items]
Concentration risk, percentage	30.00%	6.00%
Accounts Receivable | Janssen Research and Development, LLC
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	5.00%
Accounts Receivable | LabCorp DD (formerly Covance)
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%	2.00%

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