Common stock and warrants (Warrants) (Details Narrative) (USD $)	3 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended																		3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 13, 2012 Subscription Agreement Four [Member]	Nov. 30, 2012 Subscription Agreement Four [Member]	Sep. 30, 2013 Warrants Seven [Member]	Sep. 30, 2013 Warrants One [Member]	Sep. 30, 2013 Warrants Three [Member]	Sep. 30, 2013 Warrants Five [Member]	Sep. 30, 2013 Warrants Eight [Member]	Sep. 30, 2013 Warrant Holder Amendment [Member]	Sep. 30, 2013 Warrants Four [Member]	Sep. 30, 2013 Warrants Six [Member]	Sep. 30, 2013 Warrants Two [Member]	Sep. 30, 2013 Private Placement Two [Member]	Sep. 30, 2013 Private Placement Three [Member]	Sep. 30, 2013 Private Placement One [Member]	Sep. 30, 2013 Private Placement Four [Member]	Dec. 13, 2012 Subscription Agreement Four, Warrants One [Member]	Nov. 30, 2012 Subscription Agreement Four, Warrants One [Member]	Dec. 13, 2012 Subscription Agreement Four, Warrants Two [Member]	Nov. 30, 2012 Subscription Agreement Four, Warrants Two [Member]	Dec. 31, 2013 Warrants 1 [Member]	Dec. 31, 2013 Warrants 2 [Member]	Dec. 31, 2013 Warrants 3 [Member]	Dec. 31, 2013 Warrants 6 [Member]	Dec. 31, 2013 Warrants 7 [Member]
Issuance of Common Stock and Warrants [Line Items]
Exercise price per share					$ 6.00	$ 7.50	$ 7.50	$ 7.50	$ 9.00	$ 2.25	$ 9.00	$ 9.00	$ 9.00										$ 2.00	$ 2.00
Warrants issued, number of shares of common stock	3,881,325				125,000	541,667	833,333	333,334	306,950		183,185	112,854	93,249	1,016,518	446,188	634,916	431,950	83,333	458,333	86,166	7,083	138,333	133,333	5,000	200,000	4,917,276
Warrants vested	3,279,367																									4,096,665
Proceeds from issuance of equity, net			$ 2,285,692	$ 339,500						$ 1,490,715
Conversion of preferred stock, shares converted		3,972			62,500		83,334	93,751	154,870	662,540	99,703	82,408	85,974
Common stock issued			$ 282,299	$ 2,580,500																			$ 2,945,200
Warrants expired	150,000