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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Oct. 31, 2019 | Oct. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Deferred tax assets, Compensation and benefit accruals | $ 7,446 | $ 7,767
Deferred tax assets, Bad debt and other allowances | 905 | 426
Deferres tax assets, Capital loss and tax credit carry-forwards | 12,645 | 12,295
Deferred tax assets, Net operating losses (domestic and foreign) | 217,430 | 202,643
Deferred tax assets, Deferred license revenue | 4,264 | 4,765
Deferred tax assets, Inventory valuation allowances | 312 | 238
Deferred tax assets, Accumulated depreciation | 9,200 | 4,374
Deferred tax assets, Grant revenue | 798 | 910
Deferred tax assets, Gross | 253,000 | 233,418
Deferred tax assets, Valuation allowance | (250,985) | (231,403)
Deferred tax assets after valuation allowance | 2,015 | 2,015
Deferred tax liability, In process research and development | (2,321) | (2,356)
Deferred Tax Liability, Net | $ (306) | $ (341)

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