Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Distribution of Long-Lived Assets by Geographical Area (Details)

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Summary of Significant Accounting Policies - Schedule of Distribution of Long-Lived Assets by Geographical Area (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]    
Long lived assets $ 12,009 $ 4,810
Ireland    
Segment Reporting Information [Line Items]    
Long lived assets 9,809 4,565
U.S.    
Segment Reporting Information [Line Items]    
Long lived assets $ 2,200 $ 245