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Balance Sheet Details - Summary of Marketable Securities Available-for-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 13,497 $ 22,616
Gross Unrealized Gains 6 5
Gross Unrealized Losses 0 0
Estimated Fair Value 13,503 22,621
Short-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,497 19,173
Gross Unrealized Gains 6 5
Gross Unrealized Losses 0 0
Estimated Fair Value 13,503 19,178
Long-term marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   3,443
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Value   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 975 2,828
Gross Unrealized Gains 1 1
Gross Unrealized Losses 0 0
Estimated Fair Value 976 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
Amortized Cost   1,300
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Estimated Fair Value   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 8,152 10,635
Gross Unrealized Gains 5 3
Gross Unrealized Losses 0 0
Estimated Fair Value 8,157 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