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Short-Term and Long-Term Investments - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Marketable securities maturity period | 1 year | |||
| Realized gains or losses on short-term investments | $ 10,000 | $ 0 | $ 10,000 | $ 0 |
| Other-than-temporary impairments recognized | 0 | 0 | 0 | 0 |
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Certificates of Deposit [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||||
| Certificates of deposit | $ 250,000 | $ 250,000 | ||