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Summary of Significant Accounting Policies - Revenue by Major Payers (Details) - Customer Concentration Risk | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Medicare | Revenue Benchmark |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue | 19.00% | 20.00% | 19.00% | 21.00% |
Medicare Advantage | Revenue Benchmark |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue | 13.00% | 11.00% | 13.00% | 11.00% |
Blue Shield | Revenue Benchmark |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue | 12.00% | 12.00% | 12.00% | 12.00% |
Blue Shield | Accounts Receivable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue |  |  | 17.00% |  | 11.00%
United Healthcare | Accounts Receivable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue |  |  | 16.00% |  |
Janssen (SIMPONI) | Revenue Benchmark |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue |  | 13.00% |  | 12.00% |
Janssen (SIMPONI) | Accounts Receivable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Percent of total revenue |  |  | 11.00% |  | 35.00%

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