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Fair Value of Financial Instruments - Summary of Company's Financial Assets Carried at Fair Value (Detail) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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|
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| Contingent consideration liability |
|
$ 161,000 |
$ 212,000 |
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Recurring [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Contingent consideration liability |
|
161,000 |
|
|
Recurring [Member] | Money Market Funds [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Cash equivalents |
28,210,000 |
49,209,000 |
|
|
Recurring [Member] | Bank Deposits [Member]
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|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Cash equivalents |
5,001,000 |
5,037,000 |
|
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Recurring [Member] | U.S. Government Agency Securities [Member]
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|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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|
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| Short-term marketable securities - U.S. government agency securities |
100,299,000 |
100,161,000 |
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Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Recurring [Member]
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|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Contingent consideration liability |
|
|
|
|
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Recurring [Member] | Money Market Funds [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Cash equivalents |
28,210,000 |
49,209,000 |
|
|
Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Recurring [Member] | Bank Deposits [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Cash equivalents |
|
|
|
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Quoted Prices in Active Markets for Identical Items (Level 1) [Member] | Recurring [Member] | U.S. Government Agency Securities [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Short-term marketable securities - U.S. government agency securities |
75,288,000 |
90,138,000 |
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Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
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|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Contingent consideration liability |
|
|
|
|
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Money Market Funds [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Cash equivalents |
|
|
|
|
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Bank Deposits [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Cash equivalents |
5,001,000 |
5,037,000 |
|
|
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | U.S. Government Agency Securities [Member]
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|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Short-term marketable securities - U.S. government agency securities |
25,011,000 |
10,023,000 |
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Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]
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|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Contingent consideration liability |
|
161,000 |
|
|
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Money Market Funds [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Cash equivalents |
|
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Bank Deposits [Member]
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
| Cash equivalents |
|
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | U.S. Government Agency Securities [Member]
|
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
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| Short-term marketable securities - U.S. government agency securities |
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