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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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| Significant Accounting Policies [Line Items] |
|
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| Maturity of highly liquid investments |
Three months or less |
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| Maturity of certificate |
More than three months |
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| Carrying value of cash held in money market funds |
$ 27,000,000 |
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| Allowance recorded |
0 |
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| Impairment losses recognized |
0 |
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| Deferred revenue interest |
0 |
0 |
| Assumed expected dividend rate |
0.00% |
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| Excess tax benefits for tax deductions |
0 |
0 |
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Level 2 [Member]
|
|
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| Significant Accounting Policies [Line Items] |
|
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| Assets measured using quoted prices |
0 |
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| Liabilities measured using quoted prices |
0 |
|
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Level 3 [Member]
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|
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| Significant Accounting Policies [Line Items] |
|
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| Assets measured using quoted prices |
0 |
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| Liabilities measured using quoted prices |
$ 0 |
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Minimum [Member]
|
|
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| Significant Accounting Policies [Line Items] |
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| Property and equipment, estimated useful life |
3 years |
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Maximum [Member]
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|
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| Significant Accounting Policies [Line Items] |
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| Property and equipment, estimated useful life |
5 years |
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