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Fair Value Measurements and Marketable Securities - Additional Information (Detail)
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6 Months Ended |
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Jun. 30, 2013
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| Schedule of Available-for-sale Securities [Line Items] | |
| Weighted average maturity for available-for-sale securities | 8 months |
| Shares of common stock to be purchased with warrants | 9,600,000 |
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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 | 2015-03 |
| 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
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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