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Summary Of Significant Accounting Policies - Revenue by Major Payers (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Revenue Benchmark | Supplier Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue		97.00%	95.00%
Medicare | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue		25.00%	30.00%
Medicare | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	26.00%
Blue Shield | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue		12.00%	14.00%
Blue Shield | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	15.00%
United Healthcare | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue		11.00%	12.00%
United Healthcare | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	11.00%	22.00%
Medicare Advantage | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue		11.00%	10.00%
Medicare Advantage | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	11.00%
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		82.00%	82.00%

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