Shareholders' Equity and Capital Stock  Assumptions (Details) 
9 Months Ended  

Sep. 30, 2015 
Sep. 30, 2014 

Expected option life (years)  3 years 5 months 27 days  
Expected volatility  66.00%  
Riskfree interest rate  1.40%  
Expected dividend rate  0.00%  
Forfeiture rate (options)  4.50%  
Maximum [Member]  
Forfeiture rate (RSUs)  8.30%  
Expected option life (years)  3 years 7 months 17 days  
Expected volatility, Maximum  57.00%  
Riskfree interest rate, Maximum  0.70%  
Forfeiture rate (options)  5.00%  
Minimum [Member]  
Forfeiture rate (RSUs)  7.80%  
Expected option life (years)  3 years 7 months 6 days  
Expected volatility, Minimum  56.00%  
Riskfree interest rate, Minimum  0.50%  
Forfeiture rate (options)  4.90% 
X  
 Definition The forfeiture rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition The forfeiture rate assumption that is used in valuing restricted share units on its own shares. No definition available.

X  
 Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef

X  
 Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef

X  
 Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The riskfree interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef

X  
 Definition The maximum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition The minimum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition Expected term of sharebased compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef

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