Board of directors fees (Details) - USD ($)	Sep. 30, 2015	Jul. 31, 2015	Jun. 30, 2015	Jan. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Jan. 31, 2014
Board of Directors fees
Warrants valued	$ 114,188	$ 4,876	$ 6,185	$ 3,664	$ 4,074	$ 7,311	$ 13,460
Volatility rate	152.53%	155.43%	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%	0.00%
Discount rate	0.75%	0.11%	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