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Stockholders' Equity - Additional Information (Detail) (USD $) | 6 Months Ended |  | 0 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jul. 27, 2010 | Jul. 27, 2010 Stock warrants [Member] | Jun. 30, 2014 Stock warrants [Member] | Jun. 30, 2014 Stock warrants [Member] Re-measuring [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 |  | $ 9.60 |  |  |
Date from which warrants or rights exercisable | Oct. 14, 2010 |  |  |  |  |
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% |  | 26.41%
Contract term of expected life assumption |  |  |  |  | 5 years | 1 year 1 month 6 days
Percentage of risk free rate for warrants |  |  |  | 2.07% |  | 0.35%
Dividend yield |  |  |  | 0.00% |  | 1.30%
Decrease in fair value of stock warrants |  | $ 82,000 |  |  |  | $ 400

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- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(3)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 3 -Article 4 + Details
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