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Income Taxes - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| NOL DTA related to excess benefits from stock option exercises | $ 400,000 | ||
| Increase in valuation allowance | 7,800,000 | 11,600,000 | 10,300,000 |
| Accrued interest or penalties | 0 | 0 | |
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Federal [Member]
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| Federal and State net operating loss carryforwards | 113,000,000 | ||
| Year net operating loss carryforwards begin to expire | 2021 | ||
| Research and development credits | 1,700,000 | ||
| Year research and development credits begin to expire | 2022 | ||
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State [Member]
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| Federal and State net operating loss carryforwards | 110,000,000 | ||
| Year net operating loss carryforwards begin to expire | 2013 | ||
| Research and development credits | $ 3,700,000 | ||
| X | ||||||||||
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- Definition
Amount of net operating loss deferred tax assets related to excess benefits from stock option exercises. No definition available.
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| X | ||||||||||
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- Definition
Research And Development Tax Credits Begin Expiration. No definition available.
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| X | ||||||||||
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- Definition
The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of the change in the period in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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