Income Taxes - NOL and Tax Credit Carryforwards (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Foreign Tax Authority | Canada Revenue Agency
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 207,606
Foreign Tax Authority | Australian Taxation Office
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	109,355
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net U.S. Federal operating loss carryforwards, subject to expiration	36,030
Net U.S. Federal Operating loss carryforwards, not subject to expiration	14,416
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 5,608