Stock-Based Compensation - Schedule of Share-based Compensation Arrangement (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Shares, balance beginning of period	4,010,524	2,867,966	2,683,882	2,601,775
Shares, Options granted		1,327,432	613,647	407,251
Shares, Options exercised	(126,730)	(81,447)	(52,000)	(57,351)
Shares, Options forfeited or expired		(103,427)	(236,084)	(267,793)
Shares, balance end of period	3,835,972	4,010,524	2,867,966	2,683,882	2,601,775
Weighted Average Exercise Price
Weighted-Average Exercise Price, Balance	$ 17.81	$ 9.80	$ 8.37	$ 8.49
Weighted-Average Exercise Price, Options granted		33.94	13.17	6.66
Weighted-Average Exercise Price, Options exercised		6.67	1.69	1.69
Weighted-Average Exercise Price, Options forfeited or expired		11.49	6.12	8.49
Weighted-Average Exercise Price, Balance		$ 17.81	$ 9.80	$ 8.37	$ 8.49
Weighted-Average Remaining Contractual Life		6 years 10 months 20 days	6 years 5 months 1 day	6 years 1 month 13 days	6 years 3 months 7 days
Aggregate Intrinsic Value		$ 263,316

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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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