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Fair Value Measurements and Marketable Securities - 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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Dec. 31, 2011
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Recognized realized gains | $ 5,000 | $ 0 | $ 0 |
| Recognized realized losses | $ 0 | $ 0 | $ 0 |
| Weighted average maturity for available for sale securities | 6 months 12 days | ||
| Shares of common stock to be purchased with warrants | 8,300,000 | ||
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Maximum [Member]
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Available for sale securities, longest maturity date | 2015-05 | ||
| X | ||||||||||
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- Definition
Available for sale securities debt maturities Month. No definition available.
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| X | ||||||||||
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- Definition
Weighted average maturity for available for sale securities. No definition available.
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| X | ||||||||||
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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