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Description of the Business and Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - Customer Concentration Risk - Trade and Other Receivables	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer A
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	18.00%
Customer B
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%	27.00%

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- Definition

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.

+ References

No definition available.

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- Definition

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

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