Income Taxes - Summary of Tax Loss Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Tax loss and interest carryforwards:
Corporate income tax loss carryforwards	$ 41,334	$ 71,904
Interest carryforwards for tax purposes	31,463	28,562
Net operating loss carryforwards	72,797	100,466
No deferred tax assets were recognized for the following items:
Deductible temporary differences	41,994	40,905
Corporate income tax loss carryforwards	107,110	105,287
Interest carryforwards for tax purposes	31,463	28,562
Total	180,567	$ 174,754
Net operating loss carryforwards
Net operating loss carryforwards	107,110
Tax Credits
Tax Credits	3,185
2020 to 2026
Net operating loss carryforwards
Net operating loss carryforwards	0
Tax Credits
Tax Credits	0
2027 and thereafter
Net operating loss carryforwards
Net operating loss carryforwards	31,207
Tax Credits
Tax Credits	3,164
Indefinite carryforwards
Net operating loss carryforwards
Net operating loss carryforwards	75,903
Tax Credits
Tax Credits	$ 21