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Commitment and Contingencies - Lease Narrative (Details)
$ in Thousands, € in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2016
Aug. 31, 2015
EUR (€)
ft²
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Aug. 31, 2015
USD ($)
Loss Contingencies [Line Items]              
Rent Expense     $ 200 $ 200 $ 400 $ 500  
Future minimum payments due     1,753   1,753    
Dublin, Ireland [Member]              
Loss Contingencies [Line Items]              
Operating Leases, Area of office space (in sq ft) | ft²   6,258          
Operating leases, term of contract (in years)   10 years          
Operating Leases, Rent review term (in years)   5 years          
Operating leases, Option to terminate, date   Aug. 31, 2020          
Future minimum payments due   € 2.0 $ 1,800   $ 1,800   $ 2,400
Built-to-Suit Lease [Member]              
Loss Contingencies [Line Items]              
Build-to-suit lease expiration date Dec. 31, 2023