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Summary of Significant Accounting Policies Segment Information and Signficant Customers (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Information and Significant Customers [Abstract]
Entity Wide Revenue Sanofi Percentage	64.00%	90.00%	98.00%
Entity Wide Revenue Ipsen Percentage	18.00%	9.00%

X

- Definition

Percentage of revenue generated from Ipsen Pharma SAS that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of revenue generated from Sanofi that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

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X

- Definition

Segment Information and Significant Customers [Abstract]

+ References

No definition available.

+ Details

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