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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | Jul. 27, 2010 | Dec. 31, 2014
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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 (in usd per share) | $ 9.60 |
Fair value of warrants outstanding | $ 2.0 |
Stock warrants [Member] |  |
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 warrants | 2.07% |
Dividend yield | 0.00% |
Outstanding stock warrants |  | 0

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