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v3.19.1

Percentage of Net Revenue and Total Accounts Receivable (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Sales Revenue, Net | Payor A [Member] |  |  |  |
Accounts Receivable And Net Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 17.40% | 0.00% | [1] |
Sales Revenue, Net | Payor B [Member] |  |  |  |
Accounts Receivable And Net Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 15.30% | 12.00% |  |
Sales Revenue, Net | Payor C [Member] |  |  |  |
Accounts Receivable And Net Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 12.00% | 10.90% |  |
Accounts Receivable | Payor D [Member] |  |  |  |
Accounts Receivable And Net Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 35.30% |  |  | 34.10%
Accounts Receivable | Payor E [Member] |  |  |  |
Accounts Receivable And Net Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 42.90% |  |  | 42.20%
[1] | Less than 10% of total net revenues

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