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Share-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning balance of Outstanding, Options	2,868,053	3,085,888	2,657,723
Granted, Options	336,768	365,709	915,122
Exercised, Options	(161,072)	(288,618)	(89,773)
Forfeited, Options		(75,426)	(120,964)
Cancelled, Options	(225,316)	(219,500)	(276,220)
Ending balance of Outstanding, Options	2,818,433	2,868,053	3,085,888
Exercisable, Options	1,847,335
Beginning balance of Outstanding, Weighted Average Exercise Price	$ 9.86	$ 11.18	$ 14.27
Granted, Weighted Average Exercise Price	14.10	8.67	4.81
Exercised, Weighted Average Exercise Price	8.46	8.18	4.17
Forfeited, Weighted Average Exercise Price		6.97	5.11
Cancelled, Weighted Average Exercise Price	20.58	29.67	24.69
Ending balance of Outstanding, Weighted Average Exercise Price	9.59	$ 9.86	$ 11.18
Exercisable, Weighted Average Exercise Price	$ 10.13
Outstanding, Weighted Average Remaining Contractual Term	6 years 1 month 20 days
Exercisable, Weighted Average Remaining Contractual Term	5 years 1 month 28 days
Exercised, Aggregate Intrinsic Value	$ 987	$ 250	$ 189
Outstanding, Aggregate Intrinsic Value	12,275
Exercisable, Aggregate Intrinsic Value	$ 8,605

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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