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Fair Value Measurements - Summary of Assets Carried at Fair Value Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
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Sep. 30, 2014
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Dec. 31, 2013
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
$ 27,152 |
$ 25,771 |
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
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|
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
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| Money market funds |
19,625 |
45,268 |
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
|
|
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
19,625 |
45,268 |
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Significant Other Observable Inputs (Level 2) [Member]
|
|
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
27,152 |
25,771 |
|
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Agency Notes [Member]
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|
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
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| Securities available for sale |
17,259 |
23,988 |
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Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]
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|
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
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| Securities available for sale |
9,893 |
1,783 |
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Carrying Value [Member]
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|
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| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
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| Money market funds |
46,777 |
71,039 |
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Carrying Value [Member] | U.S. Government Agency Notes [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
17,259 |
23,988 |
|
Carrying Value [Member] | Money Market Funds [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Money market funds |
19,625 |
45,268 |
|
Carrying Value [Member] | Certificates of Deposit [Member]
|
|
|
| Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |
|
|
| Securities available for sale |
$ 9,893 |
$ 1,783 |