Warrants (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2015 $ / shares shares	Sep. 30, 2015 $ / shares shares	Nov. 21, 2012 CAD / shares	Apr. 04, 2011 CAD / shares
Class of Warrant or Right [Line Items]
Number of warrants outstanding	1,428,383	1,428,383
April 4, 2011 Warrants
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | (per share)	$ 6.74	$ 6.74		CAD 7.46
Number of warrants outstanding	733,000	733,000
November 21, 2012 Warrants
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | (per share)	$ 7.86	$ 7.86	CAD 8.70
Number of warrants outstanding	695,383	695,383
Warrants exercised	844,760	1,037,330
Shares of common stock issued	660,680	809,498