Balance Sheet Details - Available-for-Sale Securities Recorded at Fair Value with Unrealized Gains or Losses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	$ 3,079	$ 13,336
Gross unrealized loss	(1)	(8)
Fair value	3,078	13,328
Corporate notes, bonds and paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	919	9,091
Gross unrealized loss	(1)	(7)
Fair value	918	9,084
Government securities/money market [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost basis	2,160	4,245
Gross unrealized loss		(1)
Fair value	$ 2,160	$ 4,244