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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share For Out of Money Potential Common Shares (Parenthetical) (Detail) (USD $) |  |  | 3 Months Ended |  |
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Mar. 31, 2014 | May 10, 2012 | Mar. 31, 2014 Stock Options With an Exercise Price Of $2.73 per share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price Of $2.74 per share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price Of $2.89 per share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price of $3.25 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $3.30 Per Share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price of $3.40 Per Share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price of $3.43 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $3.43 Per Share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price of $3.50 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $3.50 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $3.51 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $3.53 Per Share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price of $3.90 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $3.90 Per Share [Member] | Mar. 31, 2014 Stock Options With an Exercise Price of $4.00 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $4.00 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of 5.00 Per Share [Member] | Mar. 31, 2013 Stock Options With an Exercise Price of $7.00 Per Share [Member] | Mar. 31, 2014 Warrants With an Exercise Price of $2.44 Per Share [Member] | Mar. 31, 2014 Warrants With an Exercise Price of $3.60 Per Share [Member] | Mar. 31, 2013 Warrants With an Exercise Price of $3.60 Per Share [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercise price per share |  |  | $ 2.73 | $ 2.74 | $ 2.89 | $ 3.25 | $ 3.30 | $ 3.40 | $ 3.43 | $ 3.43 | $ 3.50 | $ 3.50 | $ 3.51 | $ 3.53 | $ 3.90 | $ 3.90 | $ 4.00 | $ 4.00 | $ 5.00 | $ 7.00 |  |  |
Warrants exercise price per share | 4.32 | 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.44 | 3.60 | 3.60

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- Definition Exercise price of the option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Footnote 5 + Details
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- Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -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 4 -Article 4 + Details
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