Derivative Instruments - Additional Information (Details) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		217 Months Ended						3 Months Ended				9 Months Ended							3 Months Ended				9 Months Ended							3 Months Ended				9 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2014 CAD	May 28, 2014 USD ($)	May 28, 2014 CAD	Sep. 30, 2014 Options Held [Member] USD ($)	Dec. 31, 2013 Options Held [Member] USD ($)	Sep. 30, 2014 Investor warrants expiring April 30, 2015 [Member] USD ($)		Sep. 30, 2013 Investor warrants expiring April 30, 2015 [Member] USD ($)		Sep. 30, 2014 Investor warrants expiring April 30, 2015 [Member] USD ($)		Sep. 30, 2013 Investor warrants expiring April 30, 2015 [Member] USD ($)		Sep. 30, 2014 Investor warrants expiring April 30, 2015 [Member] CAD	Jun. 30, 2014 Investor warrants expiring April 30, 2015 [Member] USD ($)	Dec. 31, 2013 Investor warrants expiring April 30, 2015 [Member] USD ($)	Sep. 30, 2014 Investor warrants expiring March 29, 2016 [Member] USD ($)		Sep. 30, 2013 Investor warrants expiring March 29, 2016 [Member] USD ($)		Sep. 30, 2014 Investor warrants expiring March 29, 2016 [Member] USD ($)		Sep. 30, 2013 Investor warrants expiring March 29, 2016 [Member] USD ($)		Sep. 30, 2014 Investor warrants expiring March 29, 2016 [Member] CAD	Jun. 30, 2014 Investor warrants expiring March 29, 2016 [Member] USD ($)	Dec. 31, 2013 Investor warrants expiring March 29, 2016 [Member] USD ($)	Sep. 30, 2014 Options to Contractors [Member] USD ($)		Sep. 30, 2013 Options to Contractors [Member] USD ($)		Sep. 30, 2014 Options to Contractors [Member] USD ($)		Sep. 30, 2013 Options to Contractors [Member] USD ($)		Dec. 31, 2011 Options to Contractors [Member]	Dec. 31, 2010 Options to Contractors [Member]
Derivative [Line Items]
Common shares issuable upon exercise of outstanding warrants						3,835,000	180	180											1,307,000											821,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						4.32	$ 0.50	1.44											4.32											4.32
Fair value of warrants																				$ 1,587	$ 2,015										$ 1,754	$ 794
Gain (Loss) On Derivative Instruments, Net, Pretax	619	(1,708)	(1,855)	2,254	5,179						272	[1]	(1,288)	[1]	(440)	[1]	1,681	[1]				333	[1]	(394)	[1]	(1,281)	[1]	555	[1]				14	[2]	(26)	[2]	(134)	[1]	18	[1]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right																																									108,000	86,000
Derivative Liability									158	54
Gains (Losses) on Extinguishment of Debt											210		0													138		0
Adjustments To Additional Paid In Capital Warrant Issued											$ 657															$ 183

[1] Change in derivative liability resulting from the fluctuation in the price of Fennec’s shares used to value the derivative instrument.

[2] As a result of the warrant exchange concluded on July 29, 2014, holders of warrants expiring April 30, 2015 and March 29, 2016 (the “Existing (or Eligible) Warrants”) could elect to exchange their Eligible Warrants for “New Warrants”. New Warrants were denominated in the Company’s functional currency and thus, no longer considered derivative instruments under ASCA 815-40. Eligible Warrants participating in the exchange were valued on July 29, 2014 using the Black-Scholes Model and the resulting gain from the extinguishment of derivative liability was realized.