Board of directors fees (Details)	Jul. 31, 2015 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jan. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) $ / shares shares	Jan. 31, 2014 USD ($) $ / shares shares
Board of Directors fees
Warrants granted purchase common stock shares	50,000	50,000	50,000	50,000	50,000	50,000
Warrants exercise price per share \| $ / shares	$ 0.14	$ 0.15	$ 0.09	$ 0.12	$ 0.19	$ 0.38
Warrants granted vested on grant date	12,500	12,500	12,500	12,500	12,500	12,500
Warrants granted shall vest quarterly	12,500	12,500	12,500	12,500	12,500	12,500
Warrants valued \| $	$ 4,876	$ 6,185	$ 3,664	$ 4,074	$ 7,311	$ 13,460
Term of the warrants in years	3	3	3	3	3	3
Volatility rate	118.27%	155.43%	128.38%	113.93%	138.05%	121.33%
Annual rate of dividends for board of directors	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Discount rate	0.51%	1.09%	0.68%	0.59%	0.41%	0.44%
Proceeds from annual term served, paid quarterly \| $	$ 10,000	$ 10,000	$ 10,000	$ 10,000	$ 10,000	$ 10,000