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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) - $ / shares | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | May. 10, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Warrants exercise price per share | $ 3.60 | $ 3.60 | $ 3.60 | $ 3.60 | $ 3.60
Stock Options With an Exercise Price of $1.04 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 1.04 |  | 1.04 |  |
Stock Options With an Exercise Price of $1.07 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 1.07 |  | 1.07 |  |
Stock Options With an Exercise Price of $1.74 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 1.74 |  | 1.74 |  |
Stock Options With an Exercise Price of $2.20 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 2.2 |  | 2.2 |  |
Stock Options With an Exercise Price of $2.73 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 2.73 | 2.73 | 2.73 | 2.73 |
Stock Options With an Exercise Price of $2.74 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 2.74 | 2.74 | 2.74 | 2.74 |
Stock Options With an Exercise Price of $2.89 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 2.89 | 2.89 | 2.89 | 2.89 |
Stock Options With an Exercise Price of $3.25 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 3.25 | 3.25 | 3.25 | 3.25 |
Stock Options With an Exercise Price of $3.40 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 3.40 | 3.40 | 3.40 | 3.40 |
Stock Options With an Exercise Price of $3.43 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 3.43 | 3.43 | 3.43 | 3.43 |
Stock Options With an Exercise Price of $3.50 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | 3.50 | 3.50 | 3.50 | 3.50 |
Stock Options With an Exercise Price of $3.90 per Share [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock options exercise price per share | $ 3.90 | $ 3.90 | $ 3.90 | $ 3.90 |

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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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- 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 + Details
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