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Balance Sheet Details - Available-for-Sale Securities Recorded at Fair Value with Unrealized Gains or Losses (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost basis $ 4,080
Gross unrealized loss (2)
Fair value 4,078
Government Securities/Money Market [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Amortized cost basis 4,080
Gross unrealized loss (2)
Fair value $ 4,078