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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, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 55,086 | $ 32,841
Stock based compensation | 9,155 | 5,706
Depreciation | (189) | 40
Tax credits | 5 | 6
Other reserves and accrued liabilities | 818 | 53
Net deferred tax asset | 64,875 | 38,646
Less: valuation allowance | (55,894) | (33,379)
Deferred Tax Assets, Net of Valuation Allowance, Total | $ 8,981 | $ 5,267

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