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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011
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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

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