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Summary of Significant Accounting Policies - Accounts Receivable, net (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts receivable | Credit concentration
Accounts Receivable, net
Customers individually representing greater than this percentage for disclosure	12.00%	11.00%

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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