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Available for Sale Securities by Original Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, carrying value $ 33,903 $ 30,700
Due greater than one year and less than three years, carrying value 0 6,134
Total cash equivalents and short-term investments, carrying value 33,903 36,834
Due in one year or less, fair value 33,911 30,701
Due greater than one year and less than three years, fair value 0 6,140
Total cash equivalents and short-term investments, fair value $ 33,911 $ 36,841