Equity Narrative (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Mar. 31, 2015 plan	Mar. 31, 2014	Mar. 31, 2015 plan	Mar. 31, 2014	Dec. 10, 2014	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive compensation plans maintained by the company	3		3
Compensation cost not yet recognized, period for recognition			3 years 3 months 18 days
Unvested restricted stock units	593,203		593,203
Share-based compensation, included in discontinued operations	$ 100,000	$ 400,000	$ 900,000	$ 700,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan (ESPP), biannual plan duration			6 months
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 options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, average minimum vesting period (in years)			4 years
Stock options, average maximum vesting period (in years)			5 years
Stock options, contractual life (in years)			10 years
Unrecognized compensation expense	200,000		200,000
Compensation cost not yet recognized, period for recognition			2 years 6 months
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Remaining unamortized stock-based compensation expense	2,700,000		2,700,000
Remaining unamortized stock-based compensation expense, period for recognition (in years)			2 years 6 months 0 days
Unvested restricted stock units	593,203		593,203			966,579
Outstanding non-vested RSUs aggregate intrinsic value	3,200,000		3,200,000
Outstanding non-vested RSUs weighted average remaining contractual term (in years)			1 year 7 months 6 days
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, vested			4,400,000	1,600,000
Share-based compensation arrangement, by share-based payment award, options, vested and expected to vest, exercisable, number	500,000		500,000
Share based compensation arrangement, by share based payment award, equity instruments other than options, expected to vest, intrinsic value	$ 3,000,000		$ 3,000,000
Share based compensation arrangement, by share based payment award, equity investments other than options, expected to vest, weighted average contractual term (in years)			1 year 7 months 6 days
Weighted average grant date fair value, shares granted (USD per share)			$ 5.36	$ 4.89
Vested (in shares)			(838,827)		(300,000)