Income Taxes - Summary of Net Operating Loss Carryforwards (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 537,325
Australia
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	12,064
France
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	15,538
Germany
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	13,436
Japan
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	20,203
Luxembourg
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	24,252
Netherlands
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	23,889
Other
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	45,171
United Kingdom
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	258,423
United States - Federal and various states
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 124,349