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Basis of Presentation and Summary of Significant Accounting Policies - Contributions to Revenue and Receivables by Payor (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net revenue | Payor A |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 12.50% | 13.60% | 14.60%
Net revenue | Payor B |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 10.90% | 13.40% | 18.70%
Net revenue | Payor C |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk |  |  | 14.10%
Net revenue | Payor D |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 13.10% | 11.70% | 14.10%
Net revenue | Payor E |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 16.90% | 12.90% |
Gross receivables | Payor F |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 43.90% | 30.40% |
Gross receivables | Payor G |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk | 36.50% | 36.00% |

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