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Income Taxes (Details 1) - USD ($) $ in Thousands | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
--- | --- | --- | ---
Deferred income tax assets: |  |  |
Bad debt reserve | $ 540 | $ 455 |
Accrued expenses | 3,134 | 3,758 |
Stock options and restricted stock | 866 | 1,070 |
Charitable contributions | 734 | 946 |
Depreciation | 151 | 349 |
Unrealized gain | (231) |  |
Net operating loss | 72,625 | 75,110 |
Transaction taxes | 2,000 |  |
Deferred revenue | (1,060) |  |
Total deferred income tax assets | 78,759 | 81,688 |
Valuation allowance | (74,170) | (76,020) | $ (129,872)
NET DEFERRED INCOME TAX ASSETS | $ 4,589 | $ 5,668 |

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