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Income Taxes - Summary of Net Operating Loss Carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 132,216
Total NOL and Other Carryforwards	169,211
Canada province
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	49,282
Foreign Tax Authority
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	7,370
U.S. states
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 11,318
U.S. states | Latest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2030
Canada Revenue Agency
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 51,310
Canada Revenue Agency | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2024
United Kingdom
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 12,936
Other Carryforwards
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	36,995
Other Carryforwards | Canada province
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	$ 24,960
Other Carryforwards | Canada province | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Other Carryforwards, expiration date	2024
Other Carryforwards | Canada province | Latest period
Deferred tax assets, operating loss, and other carryforwards
Other Carryforwards, expiration date	2038
Other Carryforwards | Canada (credit)
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	$ 1,206
Other Carryforwards | U.S. states | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Other Carryforwards, expiration date	2019
Other Carryforwards | U.S. states | Latest period
Deferred tax assets, operating loss, and other carryforwards
Other Carryforwards, expiration date	2030
Other Carryforwards | Canada Revenue Agency
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	$ 10,829
Other Carryforwards | Canada Revenue Agency | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Other Carryforwards, expiration date	2024
Other Carryforwards | Canada Revenue Agency | Latest period
Deferred tax assets, operating loss, and other carryforwards
Other Carryforwards, expiration date	2038

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- Definition

Amount of operating loss and tax credit carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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