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Summary of Significant Accounting Policies Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Disclosure On Geographic Areas Revenue From External Customers Attributed to France	60.00%	83.00%	99.00%
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile, Percent	40.00%	17.00%	1.00%

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- Definition

Revenues from external customers attributed to the entity's country of domicile as a percentage of total revenue.

+ References

No definition available.

+ Details

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- Definition

Revenues from external customers attributed to France as a percentage of total revenue.

+ References

No definition available.

+ Details

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- References

No definition available.

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