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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
	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

X

- 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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+ References

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