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Stock-Based Compensation - Summary of Company's Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options Outstanding, Beginning Balance	1,721,000	1,111,000	674,000
Number of Options, Granted	800,000	683,000	495,000
Number of Options, Exercised	(305,000)	(6,000)	(52,000)
Number of Options, Cancelled / forfeited	(207,000)	(67,000)	(6,000)
Number of Options Outstanding, Ending Balance	2,009,000	1,721,000	1,111,000
Weighted Average Exercise Price, Beginning Balance	$ 5.52	$ 4.95	$ 3.43
Weighted Average Exercise Price, Granted	15.49	6.48	6.72
Weighted Average Exercise Price, Exercised	4.36	1.18	2.08
Weighted Average Exercise Price, Cancelled / forfeited	8.04	6.35	3.20
Weighted Average Exercise Price, Ending Balance	$ 9.40	$ 5.52	$ 4.95

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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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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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Number of share options (or share units) exercised during the current period.

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