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Stockholders' Equity - 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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| Stockholders Equity Note [Line Items] | |||
| Number of shares of common stock to be purchased by issuing warrants | 250,000 | ||
| Exercise price of stock warrants | 9.60 | ||
| Warrants expiration date | Oct. 14, 2015 | ||
| Fair value of warrants outstanding | $ 2,000,000 | $ 883,000 | |
| Dividend yield | |||
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Stock warrants [Member]
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| Stockholders Equity Note [Line Items] | |||
| Percentage of weighted average expected stock volatility for warrant | 111.46% | ||
| Contract term of expected life assumption | 5 years | ||
| Percentage of risk free rate for warrant | 2.07% | ||
| Dividend yield | 0.00% | ||
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Stock warrants [Member] | Remeasuring [Member]
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| Stockholders Equity Note [Line Items] | |||
| Percentage of weighted average expected stock volatility for warrant | 46.82% | ||
| Contract term of expected life assumption | 2 years 9 months 18 days | ||
| Percentage of risk free rate for warrant | 0.45% | ||
| Dividend yield | 0.00% | ||
| Increase in fair value of warrants | $ 23,000 | ||
| X | ||||||||||
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- Definition
Class of warrants or rights expiration date. No definition available.
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- Definition
Fair value of warrants outstanding. No definition available.
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- Definition
Increase Decrease in Fair Value of Warrants Due to Remeasurement No definition available.
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- Details
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| X | ||||||||||
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- Definition
The exercise price of each class of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average expected volatility of stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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