Stockholders' equity (Details 1)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2012
Shares
Outstanding, beginning balance	9,559,113
Warrants issued during the year for consulting and advisory services	138,333	820,000	2,589,667
Outstanding, ending balance	9,544,657	9,559,113
Warrants [Member]
Shares
Outstanding, beginning balance	7,907,435
Warrants issued during the year for consulting and advisory services	138,333
Warrants issued in connection with sales of common and preferred stock	200,000
Warrants expired or cancelled during the year	(267,778)
Warrants exercised
Outstanding, ending balance	7,977,990
Warrants [Member]
Shares
Outstanding, beginning balance		7,396,481	3,599,761
Warrants issued during the year for consulting and advisory services		486,667	2,196,333
Warrants issued in connection with sales of common and preferred stock		726,383	1,780,971
Warrants expired or cancelled during the year		(39,667)	(133,513)
Warrants exercised		(662,429)	(47,071)
Outstanding, ending balance		7,907,435	7,396,481