Income Taxes - Summary of Net Operating Loss Carryforwards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 121,282
Total NOL and Other Carryforwards	172,039
Canada province
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 50,499
Canada province | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2025
Canada province | Latest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2039
Foreign Tax Authority
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 7,039
U.S. states
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 8,961
U.S. states | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2020
U.S. states | Latest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2030
Canada
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 50,191
Canada | Earliest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2025
Canada | Latest period
Deferred tax assets, operating loss, and other carryforwards
Operating loss carryforward expiration	2039
United Kingdom
Deferred tax assets, operating loss, and other carryforwards
Net operating loss (NOL) carryforwards	$ 4,592
Other Carryforwards
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	50,757
Other Carryforwards | Canada province
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	31,463
Other Carryforwards | Canada (credit)
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	$ 1,962
Other Carryforwards, expiration date	2036
Other Carryforwards | Canada
Deferred tax assets, operating loss, and other carryforwards
Other deductible carryforwards	$ 17,332