Equity Transactions - Employee Options (Details) - Employee and director options - $ / shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Stock option activity
Options outstanding at the beginning of the period (in shares)	1,472,643	1,465,907	1,592,406
Options granted (in shares)	583,228	310,177	437,755
Options exercised (in shares)	(1,251)	(14,869)	(383,160)
Options cancelled (in shares)	(346,133)	(288,572)	(181,094)
Options outstanding at the end of the period (in shares)	1,708,487	1,472,643	1,465,907
Options exercisable at the end of the period (in shares)	979,633
Weighted-Average Exercise Price
Options outstanding at the beginning of the period (in dollars per share)	$ 17.46	$ 19.50	$ 16.46
Options granted (in dollars per share)	6.68	9.92	22.41
Options exercised (in dollars per share)	7.48	7.09	10.83
Options cancelled (in dollars per share)	16.99	20.26	18.14
Options outstanding at the end of the period (in dollars per share)	13.91	$ 17.46	$ 19.50
Options exercisable at the end of the period (in dollars per share)	$ 17.76