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Provision for Income Taxes (Details 2) - USD ($) $ in Thousands | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Accrued liabilities | $ 21 | $ 38
Depreciation and amortization | 0 | 9
State taxes | 1 | 1
Stock-based compensation expense | 4,803 | 4,511
Capitalized research and development costs | 433 | 556
Foreign net operating loss carry-forward | 235 | 244
Net operating loss carry-forward | 9,719 | 5,608
Total deferred tax assets | 15,212 | 10,968
Less: Valuation allowance | (15,212) | (10,968)
Net deferred tax asset | $ 0 | $ 0

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