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Income Taxes (Details 3) - USD ($) $ in Thousands | May 31, 2016 | May 31, 2015
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforward | $ 52,593 | $ 52,025
Stock-based compensation | 4,135 | 4,468
Federal and state R&D tax credit carryforward | 2,145 | 1,646
Inventories | 4,535 | 2,808
Expenses incurred not currently deductible | 3,018 | 2,107
Deferred revenue | 339 | 114
Gross deferred tax asset | 66,765 | 63,168
Deferred tax liabilities |  |
Excess tax over book depreciation and amortization | 46,240 | 42,988
Gross deferred Liability | 46,240 | 42,988
Valuation Allowance | (42,209) | (1,791)
Net deferred tax liability | $ (21,684) |
Net deferred tax asset (liability) |  | $ 18,389

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