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Financial Statement Details - Summary of Marketable Securities Available-for-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 22,616 $ 39,241
Gross Unrealized Gains 5 24
Gross Unrealized Losses 0 0
Estimated Fair Value 22,621 39,265
Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 19,173 38,041
Gross Unrealized Gains 5 23
Gross Unrealized Losses 0 0
Estimated Fair Value 19,178 38,064
Long-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,443 1,200
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Estimated Fair Value 3,443 1,201
Government agency securities [Member] | Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Maturity in Years 1 or less 1 or less
Amortized Cost 2,350 3,265
Gross Unrealized Gains 1 1
Gross Unrealized Losses 0 0
Estimated Fair Value 2,351 3,266
Municipal bonds [Member] | Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Maturity in Years 1 or less 1 or less
Amortized Cost 2,828 11,246
Gross Unrealized Gains 1 14
Gross Unrealized Losses 0 0
Estimated Fair Value 2,829 11,260
Certificates of deposit [Member] | Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Maturity in Years 1 or less 1 or less
Amortized Cost 3,360 6,200
Gross Unrealized Gains 0 5
Gross Unrealized Losses 0 0
Estimated Fair Value 3,360 6,205
Certificates of deposit [Member] | Long-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Maturity in Years 1 to 2 1 to 2
Amortized Cost 1,300 1,200
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Estimated Fair Value 1,300 1,201
Corporate debentures / bonds [Member] | Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Maturity in Years 1 or less 1 or less
Amortized Cost 10,635 17,330
Gross Unrealized Gains 3 3
Gross Unrealized Losses 0 0
Estimated Fair Value 10,638 17,333
Corporate debentures / bonds [Member] | Long-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Maturity in Years 1 to 2  
Amortized Cost 2,143  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Estimated Fair Value $ 2,143