Equity (Narrative) (Details)							1 Months Ended	12 Months Ended
	Jun. 15, 2015 USD ($) $ / shares shares	Dec. 10, 2014 USD ($) employee shares	Mar. 05, 2014 shares	Sep. 18, 2013 USD ($) shares	Oct. 03, 2012 USD ($) shares	Aug. 23, 2012	Aug. 31, 2012 USD ($)	Sep. 30, 2015 USD ($) plan $ / shares shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2013 USD ($) $ / shares shares	Sep. 30, 2012 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchases of common stock | $	$ 45,000,000							$ 45,650,000	$ 0	$ 0
Shares acquired (in shares)	6,900,000
Average cost per share (in usd per share) | $ / shares	$ 6.55
Repurchase costs | $	$ 700,000
Registered amount | $							$ 50,000,000
Effective period for shelf registration						3 years
Issuance of common stock from stock sales (in shares)				2,875,000	1,832,410
Proceeds from issuance of common stock | $				$ 11,700,000	$ 9,500,000
Number of equity incentive compensation plans maintained by the company | plan								3
Intrinsic value of shares exercised | $								$ 305,000	100,000	94,000
Number of employees affected | employee		80
Unvested restricted stock units (in shares)								570,231
Stock-based compensation expense | $								$ 3,620,000	$ 2,987,000	$ 2,644,000
Common stock, shares authorized (in shares)								50,000,000	50,000,000
Preferred stock, shares authorized (in shares)								5,882,000	5,882,000
Preferred stock, par value (in usd per share) | $ / shares								$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)								32,586,000	31,149,000
Common stock, shares outstanding (in shares)								25,676,000	31,109,000
Number of outstanding warrants (in shares)								0	400,001
Cash matching contribution | $								$ 200,000
Aggregate common shares issued (in shares)								2,278,272
Issuance of common stock - ODPP (in shares)								0	1,600	4,500
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation (in shares)								1,391,000	1,936,000	2,672,000
Employee stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, average minimum vesting period								4 years
Stock options, average maximum vesting period								5 years
Stock options, contractual life								10 years
Unrecognized compensation expense | $								$ 200,000
Unrecognized compensation expense, period for recognition								4 years 1 month 6 days
Number of shares affected (in shares)		56,000
Incremental expense (benefit) with modification | $		$ (200,000)
Stock-based compensation expense | $								$ 194,000	$ 135,000	$ 293,000
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								3 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares affected (in shares)		147,000
Incremental expense (benefit) with modification | $		$ 49,000
Remaining unamortized stock-based compensation expense | $								$ 2,100,000
Remaining unamortized stock-based compensation expense, period for recognition								2 years
Unvested restricted stock units (in shares)								570,231	966,579
Outstanding non-vested RSUs aggregate intrinsic value | $								$ 3,900,000
Outstanding non-vested RSUs weighted average remaining contractual term								1 year 2 months 12 days
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, vested | $								$ 4,600,000	$ 2,400,000	$ 1,200,000
Share-based compensation arrangement, by share-based payment award, options, vested and expected to vest, exercisable, number								500,000
Share based compensation arrangement, by share based payment award, equity instruments other than options, expected to vest, intrinsic value | $								$ 3,700,000
Share based compensation arrangement, by share based payment award, equity investments other than options, expected to vest, weighted average contractual term								1 year 2 months 12 days
Weighted average grant date fair value, shares granted (in usd per share) | $ / shares								$ 5.38	$ 4.89	$ 4.63
Vested (in shares)		300,000						873,183
401(k) match in common stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $								$ 300,000	$ 500,000	$ 500,000
2012 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)			1,000,000
Number of shares authorized (in shares)			2,000,000
Employee stock purchase plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized (in shares)			1,000,000
Employee Stock Purchase Plan (ESPP), Employee Purchase Price Percentage								85.00%
Employee Stock Purchase Plan (ESPP), Annual Employee Contribution Limit Percentage								10.00%
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $								$ 25,000
Employee Stock Purchase Plan ESPP, Total Shares			3,250,000								2,250,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock from stock sales (in shares)										4,707,000
Common stock, shares outstanding (in shares)								25,676,000	31,109,000	29,982,000	24,372,000
Issuance of common stock - ESPP (in shares)								121,000	341,000	344,000
Issuance of common stock - ODPP (in shares)									2,000	5,000
Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $								$ 969,000	$ 1,452,000	$ 1,565,000