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Balance Sheet Details - Summary of Marketable Securities Available-for-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 16,052 $ 22,616
Gross Unrealized Gains 6 5
Gross Unrealized Losses 0 0
Estimated Fair Value 16,058 22,621
Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,332 19,173
Gross Unrealized Gains 6 5
Gross Unrealized Losses 0 0
Estimated Fair Value 15,338 19,178
Long-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 720 3,443
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 720 3,443
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 1,150 2,350
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Estimated Fair Value 1,150 2,351
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 1,762 2,828
Gross Unrealized Gains 1 1
Gross Unrealized Losses 0 0
Estimated Fair Value 1,763 2,829
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 3,220 3,360
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 3,220 3,360
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 720 1,300
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 720 1,300
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 9,200 10,635
Gross Unrealized Gains 5 3
Gross Unrealized Losses 0 0
Estimated Fair Value 9,205 10,638
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