Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Components of deferred income taxes and result from differences in the recognition of transactions for income tax and financial reporting purposes
Depreciable assets	$ 1,146	$ 827
Deferred revenue	85	101
Accruals and reserves	362	566
Stock-based compensation	3,883	6,927
Impaired investments	6,455	6,151
Unrealized (gains) losses on investments	(131)	96
Other	755	718
Valuation allowance	(6,530)	(6,227)
Total deferred tax assets	6,025	9,159
Less current deferred tax assets	(219)	(327)
Noncurrent deferred tax assets	$ 5,806	$ 8,832