Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Shareholders' equity and capital stock (Details 6)

v2.4.0.6
Shareholders' equity and capital stock (Details 6)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Expected warrant life (years) 1 year 6 months 0 years 2 years 9 months
Expected volatility, Minimum 63.00% 79.00% 81.00%
Expected volatility, Maximum 78.00% 82.00% 82.00%
Risk-free interest rate, Minimum 1.00% 1.30% 1.70%
Risk-free interest rate, Maximum 1.30% 1.90% 1.90%
Forfeiture rate (warrants) 0.00% 0.00% 0.00%
Forfeiture rate (options)     4.30%
Forfeiture rate (RSUs)   5.00% 5.00%
Expected dividend rate 0.00% 0.00% 0.00%
Maximum [Member]
     
Expected option life (years) 3 years 4 months 13 days 3 years 3 months 11 days 3 years 1 month 21 days
Forfeiture rate (options) 4.80% 5.10%  
Forfeiture rate (RSUs) 22.30%    
Minimum [Member]
     
Expected option life (years) 3 years 3 months 15 days 3 years 2 months 27 days 3 years 1 month 13 days
Forfeiture rate (options) 4.60% 4.40%  
Forfeiture rate (RSUs) 12.50%