Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Summary of Share Option Transactions and Number of Share Options Outstanding

Share option transactions and the number of share options outstanding during the years ended December 31, 2017 and 2016, are summarized as follows:

	Number of share options			Weighted average exercise price (C$)
Outstanding at January 1, 2016		2,146,550			14.73
Granted		255,000			3.30
Expired		(523,600	)		21.37
Forfeited		(92,500	)		8.71
Outstanding at December 31, 2016		1,785,450			11.47
Granted		796,900			5.26
Exercised		(60,000	)		3.30
Expired		(197,500	)		25.72
Forfeited		(190,000	)		10.30
Outstanding at December 31, 2017		2,134,850			8.29
Exercisable at December 31, 2017		1,274,825			10.34

Schedule of Share Options Outstanding and Exercisable

Share options outstanding and exercisable at December 31, 2017, are as follows:

Exercise price range (C$)	Number of options outstanding		Weighted average exercise price (C$)		Weighted average remaining life of options (years)		Number of options exercisable		Weighted average exercise price (C$)		Weighted average remaining life of options (years)
2.50 - 10.00		1,695,750		5.49		3.51		835,725		5.73		2.82
10.01 - 20.00		336,500		15.43		1.64		336,500		15.43		1.64
20.01 - 31.40		102,600		31.20		3.61		102,600		31.20		3.61
		2,134,850		8.29		3.22		1,274,825		10.34		2.57

Summary of Weighted Average Assumptions Used for Valuation of Share Options Granted

The following are the weighted average assumptions used for the Black-Scholes option pricing model valuation of share options granted during the years ended December 31, 2017 and 2016:

	Years ended December 31,
		2017			2016
Risk-free interest rate			1.2	%		1.0	%
Expected life of options		4.5 years			5.0 years
Annualized volatility			75.4	%		73.0	%
Forfeiture rate			2.2	%		2.2	%
Dividend rate			0.0	%		0.0	%

Schedule of Grants of Deferred Share Units, Restricted Share Units and Performance Share Units under Long-Term Incentive Plan

DSU, RSU and PSU Activity	DSUs (thousands)			DSU Fair Value			RSUs (thousands)			RSU Fair Value			PSUs (thousands)			PSU Fair Value
At January 1, 2016		-	$	-			-		$	-			-		$	-
At December 31, 2016		-	$		-			-	$		-			-	$		-
Granted		113			492			175			762			175			1,318
Change in value		-			(77	)		-			(119	)		-			(228	)
At December 31, 2017		113	$		415			175	$		643			175	$		1,090