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Balance Sheet Components - Components of Other Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Accrued compensation $ 3,435 $ 2,166
Accrued professional fees 796 658
Other 505 775
Total other accrued liabilities $ 4,736 $ 3,599