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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Segment and Concentration of Risks (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Concentration Risk [Line Items]      
Property and equipment, net $ 3,874 $ 4,976 $ 52,835
UNITED STATES      
Concentration Risk [Line Items]      
Property and equipment, net 3,900   52,800
IRELAND      
Concentration Risk [Line Items]      
Property and equipment, net $ 0   $ 0