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Income Tax Effect of Each Type of Temporary Difference Comprising Net Deferred Tax Asset (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 32,841 | $ 27,171
Stock based compensation | 5,706 | 2,997
Depreciation | 40 | 132
Tax credits | 6 | 30
Other reserves and accrued liabilities | 53 | 422
Net deferred tax asset | 38,646 | 30,752
Less: valuation allowance | (33,379) | (27,978)
Deferred Tax Assets, Net, Total | $ 5,267 | $ 2,774

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