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Stockholders' Equity - Additional Information (Detail) (USD $) | 6 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 Stock warrants [Member] | Jun. 30, 2013 Stock warrants [Member] Remeasuring [Member]
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 |  |
Percentage of weighted average expected stock volatility for warrant |  | 111.46% | 30.37%
Contract term of expected life assumption |  | 5 years | 2 years 1 month 6 days
Percentage of risk free rate for warrants |  | 2.07% | 0.58%
Dividend yield |  | 0.00% | 0.00%
Increase in fair value of warrants |  |  | $ 9,000

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