Equity (Schedule of Stock Options Activity) (Details) (USD $)	6 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Number of Shares
Outstanding, beginning of period (in shares)	1,745,948
Granted (in shares)	24,575
Exercised (in shares)	(6,100)
Forfeited (in shares)	(30,805)
Expired (in shares)	(59,230)
Outstanding, end of period (in shares)	1,674,388
Exercisable as of December 31, 2013 (in shares)	1,504,207
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 17.78
Granted (in dollars per share)	$ 4.97
Exercised (in dollars per share)	$ 4.52
Forfeited (in dollars per share)	$ 4.55
Expired (in dollars per share)	$ 20.81
Outstanding, end of period (in dollars per share)	$ 17.77
Exercisable as of March 31, 2014 (in dollars per share)	$ 19.23
Weighted Average Remaining Contractual Life (in years):
Outstanding as of March 31, 2014	3 years 8 months 27 days
Exercisable as of March 31, 2014	3 years 2 months 27 days
Vested and Expected to Vest as of March 31, 2014
Number of stock options	1,647,359
Weighted average exercise price	$ 17.99
Weighted average remaining contractual term	3 years 7 months 28 days
Aggregate Intrinsic Value (in thousands)
Exercised (in shares)	$ 4,000	[1]	$ 92,000	[1]
Exercisable as of March 31, 2014	120,000	[1]
Vested and expected to vest as of March 31, 2014	209,000	[1]
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 Stock-based Compensation Expense:
Unrecognized compensation expense	$ 600,000
Unrecognized compensation expense, period for recognition	2 years 10 months 24 days

[1] Intrinsic value for stock options represents the “in-the-money” portion or the positive variance between a stock option's exercise price and the underlying stock price. For the six months ended March 31, 2013, the intrinsic value of options exercised was $92,000.