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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instrument, Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
    
Cash equivalents    
Total cash equivalents $ 10,051 $ 3,476
Available-for-sale:    
Total short-term marketable securities 22,786 38,064
Total long-term marketable securities 11,586 1,201
Total financial assets 44,423 42,741
Fair Value, Measurements, Recurring [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 1,004 3,266
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 10,580 11,260
Total long-term marketable securities 157  
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 4,520 6,205
Total long-term marketable securities 3,220 1,201
Fair Value, Measurements, Recurring [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 6,682 17,333
Total long-term marketable securities 8,209  
Fair Value, Measurements, Recurring [Member] | Money market funds [Member]
    
Cash equivalents    
Total cash equivalents 10,047 47
Fair Value, Measurements, Recurring [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents 4 3,429
Level 1 [Member]
    
Cash equivalents    
Total cash equivalents 10,047 47
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Total financial assets 10,047 47
Level 1 [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Level 1 [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0  
Level 1 [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 1 [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0  
Level 1 [Member] | Money market funds [Member]
    
Cash equivalents    
Total cash equivalents 10,047 47
Level 1 [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Level 2 [Member]
    
Cash equivalents    
Total cash equivalents 4 3,429
Available-for-sale:    
Total short-term marketable securities 22,786 38,064
Total long-term marketable securities 11,586 1,201
Total financial assets 34,376 42,694
Level 2 [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 1,004 3,266
Level 2 [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 10,580 11,260
Total long-term marketable securities 157  
Level 2 [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 4,520 6,205
Total long-term marketable securities 3,220 1,201
Level 2 [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 6,682 17,333
Total long-term marketable securities 8,209  
Level 2 [Member] | Money market funds [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Level 2 [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents $ 4 $ 3,429