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Net revenues (Details) - Sales Revenue, Net - Customer Concentration Risk | 6 Months Ended
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Jun. 30, 2019
Hospitals And Healthcare Providers |
Concentration Risk [Line Items] |
Percentage of total revenue | 88.00%
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 | 2.00%

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