Stockholders' equity (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2012
Shares
Outstanding, beginning balance	9,559,113
Issued	138,333	820,000	2,589,667
Outstanding, ending balance	9,544,657	9,559,113
Employee Stock Option [Member]
Shares
Outstanding, beginning balance	1,651,678	1,649,110	1,486,333
Issued		333,334	393,333
Cancelled or expired	(85,011)	(330,766)	(230,556)
Outstanding, ending balance	1,566,667	1,651,678	1,649,110