Equity - Other Disclosures (Details) (USD $)	0 Months Ended			1 Months Ended	12 Months Ended					0 Months Ended		0 Months Ended	12 Months Ended			12 Months Ended
	Sep. 18, 2013	Oct. 03, 2012	Aug. 23, 2012	Aug. 31, 2012	Sep. 30, 2014 plan	Sep. 30, 2013	Sep. 30, 2012	Jan. 21, 2011	Oct. 01, 2009	Mar. 05, 2014 2012 Equity Plan	Mar. 05, 2014 2012 Equity Plan	Mar. 05, 2014 Employee stock purchase plan	Sep. 30, 2014 Employee stock purchase plan	Mar. 05, 2014 Employee stock purchase plan	Sep. 30, 2012 Employee stock purchase plan	Sep. 30, 2014 401(k) match in common stock	Sep. 30, 2013 401(k) match in common stock	Sep. 30, 2012 401(k) match in common stock	Sep. 30, 2014 Common Stock	Sep. 30, 2013 Common Stock	Sep. 30, 2012 Common Stock	Sep. 30, 2011 Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shelf registration, registered amount				$ 50,000,000
Shelf registration, effective period			3 years
Common stock issued to underwriters (in shares)	2,875,000	1,832,410																		4,707,000
Proceeds from issuance of common stock	11,700,000	9,500,000
Number of equity incentive compensation plans maintained by the company					3
Increase in total number of shares available for grant										1,000,000		1,000,000
Total number of shares authorized											2,000,000
Outside Director Fees Related To Disposal Of Operating Segment							300,000
Common stock, shares authorized (in shares)					50,000,000	50,000,000
Common stock, par value (in dollars per share)					$ 0	$ 0
Preferred stock, shares authorized (in shares)					5,882,000	5,882,000
Preferred stock, par value (in dollars per share)					$ 0.0001	$ 0.0001
Common Stock, Shares, Outstanding					31,109,000	29,982,000													31,109,000	29,982,000	24,372,000	23,481,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					400,001	400,001			400,001
Class of Warrant or Right, Warrant Agreement, Fundamental Transaction Clause, Percent of Beneficial Ownership									50.00%
Stock-based compensation expense					4,439,000	4,209,000	7,756,000									966,000	1,041,000	1,034,000
Employee stock purchase plan (ESPP), employee purchase price percentage													85.00%
Employee stock purchase plan (ESPP), annual employee contribution limit percentage													10.00%
Accelerated compensation cost													$ 25,000
Employee stock purchase plan ESPP, total shares														3,250,000	2,250,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans																			341,000	344,000	250,000
Employee Stock Purchase Plan, Aggregate Common Shares Issued					2,154,791
Officer And Director Share Purchase Plan, Shares Authorized								125,000
Stock Issued During Period, Shares, Officer And Director Stock Purchase Plans					1,600	4,500	21,000												2,000	5,000	21,000
Employee stock purchase plan (ESPP), biannual plan duration													6 months