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Shareholders' Equity and Capital Stock (Details 6)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Expected warrant life (years)   1 year 6 months 0 years
Expected volatility, Minimum 61.00% 63.00% 79.00%
Expected volatility, Maximum 66.00% 78.00% 82.00%
Risk-free interest rate, Minimum 0.90% 1.00% 1.30%
Risk-free interest rate, Maximum 1.40% 1.30% 1.90%
Forfeiture rate (warrants) 0.00% 0.00% 0.00%
Forfeiture rate (RSUs) 7.70%   5.00%
Expected dividend rate 0.00% 0.00% 0.00%
Maximum [Member]
     
Expected warrant life (years) 3 years    
Expected option life (years) 3 years 6 months 4 days 3 years 4 months 13 days 3 years 3 months 11 days
Forfeiture rate (options) 4.40% 4.80% 5.10%
Forfeiture rate (RSUs)   22.30%  
Minimum [Member]
     
Expected warrant life (years) 1 month 28 days    
Expected option life (years) 3 years 4 months 28 days 3 years 3 months 14 days 3 years 2 months 26 days
Forfeiture rate (options) 4.20% 4.60% 4.40%
Forfeiture rate (RSUs)   12.50%