Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2014	2013
Expected dividend yield	0%	–
Risk-free interest rate	1.32%	–
Expected volatility	74%	–
Expected option life (in years)	5.18	–

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

				Weighted-
			Weighted	Average
			Average	Remaining	Aggregate
	Number of		Exercise	Contractual	Intrinsic
	Options		Price	Term (years)	Value
			$		$
Outstanding, December 31, 2013	11,245,380		2.07
Granted	86,500		1.37
Forfeited	(1,814,000	)	3.43
Exercised	(268,732	)	1.22
Expired	(987,500	)	2.58
Outstanding, June 30, 2014	8,261,648		1.73	5.68	1,517,809
Exercisable, June 30, 2014	6,510,998		1.87	4.98	1,031,905

Schedule of Share-based Compensation, Non-vested Stock Options, Activity [Table Text Block]

			Weighted Average
	Number of		Grant Date
Non-vested stock options	Options		Fair Value
			$
Non-vested at December 31, 2013	1,842,150		1.07
Granted	86,500		0.75
Vested	(52,000	)	0.45
Expired	(126,000	)	1.06
Non-vested at June 30, 2014	1,750,650		1.07