Summary of Significant Accounting Policies Intangible asset (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)		$ (1,500)
Finite-Lived Intangible Assets, Amortization Expense, Year Two		1,766
Finite-Lived Intangible Assets, Amortization Expense, Year Three		1,766
Finite-Lived Intangible Assets, Amortization Expense, Year Four		1,766
Finite-Lived Intangible Assets, Amortization Expense, Year Four		1,766
Finite-Lived Intangible Assets, Amortization Expense, Year Five		1,766
Finite-Lived Intangible Assets, Amortization Expense, after Year Five		14,417
Finite-Lived Intangible Assets, Net		$ 23,247
XERMELO Intangible Assets Finite Lived	$ 24,700