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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Warrants exercise price per share | $ 3.52 |  | $ 3.52 |
Stock Options With an Exercise Price of $12.48 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 12.48 | $ 12.48 | 12.48 | $ 12.48
Stock Options With an Exercise Price of $12.84 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 12.84 | 12.84 | 12.84 | 12.84
Stock Options With an Exercise Price of $26.40 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 26.40 | 26.40 | 26.40 | 26.40
Stock Options With an Exercise Price of $34.68 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 34.68 | 34.68 | 34.68 | 34.68
Stock Options With an Exercise Price of $39.00 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 39.00 | 39.00 | 39.00 | 39.00
Stock Options With an Exercise Price of $41.16 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 41.16 | 41.16 | 41.16 | 41.16
Stock Options With an Exercise Price of $42.00 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock options exercise price per share | 42.00 | 42.00 | 42.00 | 42.00
Warrants With an Exercise Price of $12.00 per Share [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Warrants exercise price per share | $ 12 | $ 12 | $ 12 | $ 12

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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://fasb.org/us-gaap/role/ref/legacyRef -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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