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Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforward | $ 48,331 | $ 47,098
Stock-based compensation | 4,851 | 4,813
Federal and state R&D tax credit carryforward | 1,249 | 490
Inventories | 875 | 1,713
State tax credits | 0 | 1,326
Expenses incurred not currently deductible | 1,379 | 880
Capital loss carryforwards | 0 | 95
Deferred revenue | 154 | 1,147
Gross deferred tax asset | 56,839 | 57,562
Deferred tax liabilities |  |
Excess tax over book depreciation and amortization | 42,061 | 39,252
Impairment of long-lived assets | 0 | 0
Gross deferred Liability | 42,061 | 39,252
Valuation Allowance | (1,532) | (712)
Net deferred tax asset | $ 13,246 | $ 17,598

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