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Fair Value Measurement - Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Securities and Contingent Consideration Liability (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities $ 229,350 $ 128,224
Total contingent consideration liabilities 1,650 1,570
Cash equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 92,223  
Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 137,127  
Money market funds [Member] | Cash equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 92,223 6,934
U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities   121,290
U.S. government sponsored entity debt securities [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 117,222  
Contingent consideration liability [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total contingent consideration liabilities 1,650 1,570
Commercial paper securities [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 9,998  
Corporate debt securities [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 9,907  
Level 1 [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 92,223 6,934
Level 1 [Member] | Cash equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 92,223  
Level 1 [Member] | Money market funds [Member] | Cash equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 92,223 6,934
Level 2 [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 137,127 121,290
Level 2 [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 137,127  
Level 2 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities   121,290
Level 2 [Member] | U.S. government sponsored entity debt securities [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 117,222  
Level 2 [Member] | Commercial paper securities [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 9,998  
Level 2 [Member] | Corporate debt securities [Member] | Marketable securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total cash equivalents and marketable securities 9,907  
Level 3 [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total contingent consideration liabilities 1,650 1,570
Level 3 [Member] | Contingent consideration liability [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total contingent consideration liabilities $ 1,650 $ 1,570