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Summary Of Significant Accounting Policeies - Revenue by Major Payers (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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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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