Preferred Stock (Details) (USD $)	12 Months Ended			12 Months Ended				12 Months Ended				12 Months Ended						0 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013	Sep. 30, 2012 Additional Paid-in Capital [Member]	Sep. 30, 2011 Additional Paid-in Capital [Member]	Sep. 30, 2013 Preferred Stock [Member]	Sep. 30, 2012 Preferred Stock [Member]	Sep. 30, 2013 Redeemable Preferred Stock, Series A-1 [Member] director	Sep. 30, 2012 Redeemable Preferred Stock, Series A-1 [Member]	Sep. 30, 2011 Redeemable Preferred Stock, Series A-1 [Member]	Jun. 12, 2013 Redeemable Preferred Stock, Series A-1 [Member] IPO [Member]	Sep. 30, 2013 Redeemable Preferred Stock, Series A-1 [Member] Additional Paid-in Capital [Member]	Sep. 30, 2012 Redeemable Preferred Stock, Series A-1 [Member] Additional Paid-in Capital [Member]	Sep. 30, 2011 Redeemable Preferred Stock, Series A-1 [Member] Additional Paid-in Capital [Member]	Sep. 30, 2013 Series A-2 Preferred Stock [Member]	Sep. 30, 2012 Series A-2 Preferred Stock [Member]	Sep. 30, 2011 Series A-2 Preferred Stock [Member]	Jun. 12, 2013 Convertible A-1 and A-2 Preferred Stock [Member] IPO [Member]
Preferred stock
Preferred stock, shares authorized (In shares)	7,501,000		10,000,000
Preferred stock, par value (In dollars per share)			$ 0.001
Redeemable preferred stock, shares authorized								0	1,441,000
Preferred stock, shares authorized						10,000,000	10,000,000								0	1,058,000
Redeemable preferred stock, par value								$ 0.001	$ 0.001
Preferred stock, par value						$ 0.001	$ 0.001								$ 0.001	$ 0.001
Redeemable preferred stock, shares issued								0	1,015,000
Shares converted into stock																		5,336,000
Shares issued for preferred stock dividends																		412,000
Redeemable preferred stock, shares outstanding								0	1,015,000
Preferred stock, shares issued						0	0								0	805,000
Preferred stock, shares outstanding						0	0								0	805,000
Preferred stock, dividend percentage								6.00%							6.00%
Shares converted into stock											0.3521126761
Preferred stock, issue price per share (In dollars per share)								$ 9.94							$ 9.94
Preferred stock, cumulative unpaid dividends									$ 3,026,000								$ 7,161,000
Dividend declared (In dollars per share)																$ 0
Preferred stock, liquidation preference (In dollars per share)								$ 9.94							$ 9.94
Number of board of directors that preference share holders entitled to present on board								1
Value of redeemable Series A-1 preferred stock								0	43,135,000
Amount that is multiplied by 2.84 to derive carrying value of redeemable preferred stock									7.00	7.00
Amount that is used as multiple to derive carrying value of redeemable preferred stock									2.84	2.84
Redeemable Series A-1 preferred accretion	$ 3,373,000	$ 11,486,000		$ 3,373,000	$ 11,486,000			$ 3,549,000				$ 3,549,000	$ 3,373,000	$ 11,486,000