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Net revenues (Details) - Sales Revenue, Net - Customer Concentration Risk | 3 Months Ended
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Mar. 31, 2019
Hospitals And Healthcare Providers |
Concentration Risk [Line Items] |
Percentage of total revenue | 87.00%
Other Medical Device Manufacturers |
Concentration Risk [Line Items] |
Percentage of total revenue | 10.00%
Home Care Providers |
Concentration Risk [Line Items] |
Percentage of total revenue | 3.00%

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