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Income Taxes - Summary of Net Operating Loss Carryforwards (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Deferred tax assets, operating loss, and other carryforwards |
Net operating loss (NOL) carryforwards | $ 120,457
Total NOL and Other Carryforwards | 151,618
Canada province |
Deferred tax assets, operating loss, and other carryforwards |
Net operating loss (NOL) carryforwards | 46,424
Other foreign |
Deferred tax assets, operating loss, and other carryforwards |
Net operating loss (NOL) carryforwards | 14,451
U.S. states |
Deferred tax assets, operating loss, and other carryforwards |
Net operating loss (NOL) carryforwards | 10,960
Canada |
Deferred tax assets, operating loss, and other carryforwards |
Net operating loss (NOL) carryforwards | 48,622
Other Carryforwards |
Deferred tax assets, operating loss, and other carryforwards |
Other deductible carryforwards | 31,161
Other Carryforwards | Canada province |
Deferred tax assets, operating loss, and other carryforwards |
Other deductible carryforwards | 22,033
Other Carryforwards | Other foreign |
Deferred tax assets, operating loss, and other carryforwards |
Other deductible carryforwards | $ 1,226
Other Carryforwards, expiration date | 2018
Other Carryforwards | Canada |
Deferred tax assets, operating loss, and other carryforwards |
Other deductible carryforwards | $ 7,902
Earliest period | Canada province |
Deferred tax assets, operating loss, and other carryforwards |
Operating loss carryforward expiration | 2024
Earliest period | U.S. states |
Deferred tax assets, operating loss, and other carryforwards |
Operating loss carryforward expiration | 2019
Earliest period | Canada |
Deferred tax assets, operating loss, and other carryforwards |
Operating loss carryforward expiration | 2024
Latest period | Canada province |
Deferred tax assets, operating loss, and other carryforwards |
Operating loss carryforward expiration | 2037
Latest period | U.S. states |
Deferred tax assets, operating loss, and other carryforwards |
Operating loss carryforward expiration | 2028
Latest period | Canada |
Deferred tax assets, operating loss, and other carryforwards |
Operating loss carryforward expiration | 2037

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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