Stockholders' equity (Details Narrative) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended		12 Months Ended			12 Months Ended									3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013 Warrants 1 [Member]	Dec. 31, 2013 Warrants 2 [Member]	Dec. 31, 2013 Warrants 3 [Member]	Sep. 30, 2013 Warrants [Member]	Sep. 30, 2012 Warrants [Member]	Sep. 30, 2011 Warrants [Member]	Sep. 30, 2013 Warrants [Member] Maximum [Member]	Sep. 30, 2013 Warrants [Member] Minimum [Member]	Sep. 30, 2013 Employee Stock Option [Member]	Dec. 31, 2013 Employee Stock Option [Member]	Sep. 30, 2012 Employee Stock Option [Member]	Sep. 30, 2011 Employee Stock Option [Member]	Sep. 30, 2013 Third Equity Incentive Plan [Member]	Sep. 30, 2013 Second Equity Incentive Plan [Member]	Sep. 30, 2013 First Equity Incentive Plan [Member]	Dec. 31, 2013 Stock Options And Warrants [Member]	Sep. 30, 2013 Stock Options And Warrants [Member]	Sep. 30, 2012 Stock Options And Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum shares authorized for issuance																3,000,000	1,666,667	4,000,000
Outstanding	9,544,657	9,559,113					7,907,435	7,396,481	3,599,761			1,651,678	1,566,667	1,649,110	1,486,333				4,225,664	5,544,671	5,095,103
Grants in period							2,033,333
Stock-based compensation expense	$ 1,268,307	$ 9,495,292	$ 6,040,144
Unrecognized compensation expense													11,431,942
Unrecognized compensation expense, recognition period		37 months 30 days
Term of award, years										5 years 6 months	2 years	5 years
Exercise price per share					$ 2.00	$ 2.00													$ 1.95	$ 6.86
Warrants issued, number of shares of common stock	3,881,325			138,333	133,333	5,000		1,111,042
Warrants vested	3,279,367
Conversion of preferred stock, shares converted		3,972
Common stock issued					$ 2,945,200
Warrants expired	150,000