Derivative liabilities (Tables)

9 Months Ended

Sep. 30, 2014

Schedule of Derivative Instruments [Table Text Block]

Balance, December 31, 2013	$	5,118,454
Fair value change of derivative liabilities		(1,203,575	)
Fair value of preferred shares issued as dividends		101,112
Fair value of warrants issued and extended		1,095,294
Conversion of preferred shares		(315,596	)
Balance, September 30, 2014	$	4,795,689

Schedule of Stockholders' Equity Notes, Warrants or Rights, Valuation Assumptions [Table Text Block]

	September 30, 2014	December 31, 2013
Volatility	92% - 176%	92% - 186%
Risk-free interest rate	0.44% - 1.73%	0.63% - 1.39%
Expected life	1.84 – 5.00 yrs	2.19 – 4.75 yrs