Equity (Schedule of Earnings per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Equity [Abstract]
Numerator - Net income (loss)	$ (2,252)	$ (7,283)	$ 11,697	$ 2,826	$ (6,568)	$ (9,039)	$ (9,335)	$ (14,229)	$ 4,988	$ (39,171)	$ (34,219)
Less: Undistributed earnings allocated to participating securities									(26)	0	0
Undistributed earnings allocated to common shareholders for basic net income (loss) per share									4,962	(39,171)	(34,219)
Undistributed earnings allocated to common shareholders for diluted net income (loss) per share									$ 4,962	$ (39,171)	$ (34,219)
Denominator:
Denominator for basic net income (loss) per share - weighted average shares outstanding	27,158	26,609	26,310	25,977					26,531	23,559	22,228
Dilutive options outstanding, unvested stock units and ESPP									281	0	0
Denominator for diluted net income (loss) per share - adjusted weighted average shares outstanding	27,158	26,609	26,642	26,236					26,812	23,559	22,228
Net income (loss) per basic share (in dollars per share)	$ (0.08)	$ (0.27)	$ 0.44	$ 0.11					$ 0.19	$ (1.66)	$ (1.54)
Net income (loss) per diluted share (in dollars per share)	$ (0.08)	$ (0.27)	$ 0.44	$ 0.11					$ 0.19	$ (1.66)	$ (1.54)
Weighted average antidilutive options, unvested restricted stock units and awards, warrants and ESPP shares excluded from the computation									2,391	3,999	3,333
Average market price of common stock (in dollars per share)									$ 4.64	$ 4.44	$ 7.64