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Summary of Significant Accounting Policies Intangible asset (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Intangible Assets, Gross (Excluding Goodwill)   $ (1,800) $ (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   12,654  
Finite-Lived Intangible Assets, Net   $ 21,484  
XERMELO Intangible Assets Finite Lived $ 24,700