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Balance Sheet Components - Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Prepaid Expense And Other Assets [Abstract]    
Payroll and related $ 945 $ 539
Preclinical and clinical 2,399 1,726
Professional services 989 1,265
Other 144 138
Total $ 4,477 $ 3,668