Convertible Debentures (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 12, 2013	Dec. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Issuance of common stock upon conversion of debentures					$ 16,784	$ 0
Interest expense recognized			2,025	562	4,505	1,639
Common Stock [Member] | IPO [Member]
Debt Instrument [Line Items]
Offering price per share	$ 15.00
Convertible Debentures [Member]
Debt Instrument [Line Items]
Stated interest rate			8.00%		8.00%
Conversion price (usd per share)	$ 15.00
Maturity period					5 years
Debt Conversion, Converted Instrument, Including Paid-in-Kind Interest, Amount		12,392	6,643	0	19,035	0
Issuance of common stock upon conversion of debentures	5,865
Unamortized debt discount		1,387	0	2,538	0	2,538	906	2,440	2,631	529
Paid-in-Kind interest	778
Interest expense recognized			$ 1,062	$ 394	$ 3,147	$ 1,123
Convertible Debentures [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Shares isued in debt converstion	443	826
Convertible Debentures [Member] | Common Stock [Member] | IPO [Member]
Debt Instrument [Line Items]
Shares isued in debt converstion	443