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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
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Mar. 31, 2019 | Mar. 31, 2018
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
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
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
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
Stock Options With an Exercise Price of $7.16 per Share [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Stock options exercise price per share | 7.16 | 7.16
Stock Options With an Exercise Price of $12.00 per Share [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Stock options exercise price per share | $ 12.00 | $ 12.00

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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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