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Summary Of Significant Accounting Policeies - Revenue by Major Payers (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Medicare | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	25.00%	30.00%	26.00%	31.00%
Medicare | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue			23.00%		26.00%
Blue Shield | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	13.00%	14.00%	13.00%	14.00%
Blue Shield | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue			16.00%		16.00%
United Healthcare | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	10.00%	12.00%	10.00%	13.00%
United Healthcare | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue			9.00%		11.00%
Medicare Advantage | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	12.00%	12.00%	11.00%	11.00%
Medicare Advantage | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue			8.00%		11.00%
AVISE CTD Test | Revenue Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percent of total revenue	83.00%	86.00%	83.00%	86.00%

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