Description of Business (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended			0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012	Jun. 12, 2013 IPO [Member]	Jun. 12, 2013 Common Stock [Member]	Jun. 12, 2013 Common Stock [Member] IPO [Member]	Jun. 12, 2013 Underwriter [Member] Common Stock [Member]
Description of Business [Line Items]
Payments of Stock Issuance Costs						$ 6,037
Accumulated deficit	(169,910)		(141,252)
Issuance of common stock in connection with IPO, net of offering costs, shares				750,000	5,750,000	5,750,000	750,000
Aggregate offering price, net of issuance costs	79,038	0				80,213
Stock issued during period, value	77,709					77,709
Deferred offering costs						$ 2,504