Supplemental disclosure with respect to cash flows - Additional Information (Detail) (CAD)	6 Months Ended
	Jun. 30, 2011
Additional paid-in capital
Supplemental Cash Flow Information [Line Items]
Transfer of fair value of share purchase warrants exercised or expired	668,484
Warrant Liability
Supplemental Cash Flow Information [Line Items]
Transfer of fair value of share purchase warrants exercised or expired	2,154,570