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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