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Revenues - Narrative (Details)	3 Months Ended
	Mar. 31, 2018 country customer	Mar. 31, 2017
Revenue from Contract with Customer [Abstract]
Number of customers | customer	500
Number of countries in which customers are located | country	40
Minimum [Member]
Concentration Risk [Line Items]
Length of contracts	1 year
Maximum [Member]
Concentration Risk [Line Items]
Length of contracts	2 years
10 Largest Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	47.00%	43.00%

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Number of Countries in Which Customers Are Located

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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