Commitments and Contingencies (Details) (Ontario Grant [Member], CAD)	1 Months Ended	6 Months Ended	30 Months Ended
	Jun. 30, 2011	Apr. 30, 2013	Apr. 30, 2013
Ontario Grant [Member]
Gain Contingencies [Line Items]
Grant amount	25,000,000
Grant period	November 1, 2010 to October 31, 2015
Annual disbursements	5,000,000
Benefit recorded to date		2,800,000	13,700,000
Grants receivable		2,800,000	2,800,000