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Revenue (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Product revenue
Disaggregation of revenues
Total revenue	57.00%	53.00%	55.00%
Rental revenue
Disaggregation of revenues
Total revenue	22.00%	25.00%	23.00%
Field service and other revenue
Disaggregation of revenues
Total revenue	21.00%	22.00%	22.00%

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- References

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- Definition

Represents the percentage of total revenues.

+ References

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