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Summary Of Significant Accounting Policeies - Revenue by Major Payers (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Medicare | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	25.00%	26.00%
Blue Shield | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	12.00%	13.00%
Blue Shield | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	14.00%		15.00%
United Healthcare | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	10.00%	11.00%
United Healthcare | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	22.00%		22.00%
Medicare Advantage | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	13.00%	10.00%
Janssen (SIMPONI) | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue			19.00%
AVISE CTD Test | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	83.00%	85.00%

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- Definition

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No definition available.

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