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Fair Value Measurements and Marketable Securities - Financial Assets at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2013
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Dec. 31, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
$ 82,033
|
$ 70,825
|
|
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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| Total cash equivalents and marketable securities |
4,285
|
5,886
|
|
Certificates of deposit [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
1,584
|
1,185
|
|
Corporate debt securities [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
49,019
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20,242
|
|
Government securities [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
21,731
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27,899
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Municipal securities [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
2,815
|
|
|
Commercial paper [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
2,599
|
15,613
|
|
Basis of Fair Value Measurements, Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
4,285
|
5,886
|
|
Basis of Fair Value Measurements, Level 1 [Member] | Money market funds [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
4,285
|
5,886
|
|
Basis of Fair Value Measurements, Level 1 [Member] | Certificates of deposit [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 1 [Member] | Corporate debt securities [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 1 [Member] | Government securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 1 [Member] | Municipal securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 1 [Member] | Commercial paper [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 2 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
77,748
|
64,939
|
|
Basis of Fair Value Measurements, Level 2 [Member] | Money market funds [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 2 [Member] | Certificates of deposit [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
1,584
|
1,185
|
|
Basis of Fair Value Measurements, Level 2 [Member] | Corporate debt securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
49,019
|
20,242
|
|
Basis of Fair Value Measurements, Level 2 [Member] | Government securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
21,731
|
27,899
|
|
Basis of Fair Value Measurements, Level 2 [Member] | Municipal securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
2,815
|
|
|
Basis of Fair Value Measurements, Level 2 [Member] | Commercial paper [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
2,599
|
15,613
|
|
Basis of Fair Value Measurements, Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 3 [Member] | Money market funds [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 3 [Member] | Certificates of deposit [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 3 [Member] | Corporate debt securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 3 [Member] | Government securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 3 [Member] | Municipal securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
|
|
Basis of Fair Value Measurements, Level 3 [Member] | Commercial paper [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents and marketable securities |
|
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