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Income Taxes (Details 3) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforward | $ 33,880 | $ 55,975
Stock-based compensation | 2,421 | 2,653
Federal and state R&D tax credit carryforward | 3,644 | 2,548
Inventories | 1,550 | 2,407
Expenses incurred not currently deductible | 1,714 | 6,522
Deferred revenue | 277 | 1,289
Gross deferred tax asset | 43,486 | 71,394
Deferred tax liabilities |  |
Excess tax over book depreciation and amortization | 34,044 | 49,158
Gross deferred tax liability | 34,044 | 49,158
Valuation Allowance | (26,607) | (48,348)
Net deferred tax liability | (17,165) | $ (26,112)
Non-U.S. |  |
Deferred tax assets |  |
Expenses incurred not currently deductible | $ 80 |

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