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Geographic Information and Concentrations of Risk - Narrative (Details) - Customer Concentration	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Net Revenues | Customer One
Segment Reporting Information [Line Items]
Concentration percentage	56.00%	45.10%	54.70%	46.90%
Accounts Receivable | Customer One
Segment Reporting Information [Line Items]
Concentration percentage			27.30%		30.50%
Accounts Receivable | Customer Two
Segment Reporting Information [Line Items]
Concentration percentage			11.00%		12.80%

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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- Definition

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+ References

No definition available.

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