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Stock-Based Awards - Summary of Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options, beginning balance	1,158,828	1,368,247	1,544,597
Options, Granted	0
Options, Forfeitures/expirations	0
Options, Exercised	(588,291)	(209,419)	(176,350)
Options, ending balance	570,537	1,158,828	1,368,247
Weighted Average Exercise Price of Options, beginning balance	$ 2.75	$ 2.82	$ 2.62
Weighted Average Exercise Price of Options, Granted	0
Weighted Average Exercise Price of Options, Forfeitures or expirations	0
Weighted Average Exercise Price of Options, Exercised	1.19	3.17	1.11
Weighted Average Exercise Price of Options, ending balance	$ 4.36	$ 2.75	$ 2.82

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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-SubTopic 10
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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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