|
Income taxes (Details Textual) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2013
United States [Member]
|
Dec. 31, 2013
CANADA
|
|
| Deferred Tax Assets, Operating Loss Carryforwards, Foreign | $ 54.4 | |||
| Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 22.0 | |||
| Percentage Of Likelihood Realized Upon Settlement | 50.00% | |||
| Operating Loss Carryforward Expiration Date | 2017 through 2033 | 2014 through 2033 | ||
| Asset Retirement Obligation, Current | $ 5.7 | |||
| X | ||||||||||
|
- Definition
Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. No definition available.
|
| X | ||||||||||
|
- Definition
The tax position that has been subsequently be measured as the largest amount of tax benefit that has a greater than the specified percentage of likelihood which is being realized upon ultimate settlement with the tax authority. No definition available.
|
| X | ||||||||||
|
- Definition
Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|