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Summary of Significant Accounting Policies - Summary of Revenue and Accounts Receivable by Third-party Payors and Other Customers (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue
Concentration Risk [Line Items]
Concentration risk, percentage	47.00%
Revenue | The Big Ten Conference
Concentration Risk [Line Items]
Concentration risk, percentage	30.00%
Revenue | Centura Healthcare
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%
Revenue | Medicare
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%	36.00%
Revenue | Covance Central Laboratory Services
Concentration Risk [Line Items]
Concentration risk, percentage		21.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	76.00%	83.00%
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	6.00%	18.00%
Accounts Receivable | Covance Central Laboratory Services
Concentration Risk [Line Items]
Concentration risk, percentage	2.00%	43.00%
Accounts Receivable | Janssen Research and Development, LLC
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%	12.00%
Accounts Receivable | Pfizer, Inc
Concentration Risk [Line Items]
Concentration risk, percentage	4.00%	10.00%

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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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