INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Deferred tax assets
Net operating loss carryforwards	$ 26,067	$ 16,014
Tax credit carryforwards	1,246	1,618
Stock option compensation expense	8,047	7,105
Book accruals	4,859	3,273
Deferred tax assets	40,219	28,010
Deferred tax liabilities
Difference in book and tax basis of equipment	(10,572)	(12,222)
Deferred tax liabilities	(10,572)	(12,222)
Net deferred tax assets (liabilities) before valuation allowance	29,648	15,788
Valuation allowance	(38,439)	(25,568)
Deferred income tax assets (liabilities) net	(8,791)	(9,780)
Net current deferred tax assets	0	0
Net noncurrent deferred tax liabilities	$ (8,791)	$ (9,780)