Share-Based Compensation - Summary of Stock Award Activity for the Period (Detail)	3 Months Ended
Mar. 31, 2021 $ / shares shares
Share Based Arrangements To Obtain Goods And Services [Abstract]
Number of Shares, Awards outstanding, Beginning balance \| shares	4,453,357
Number of Shares, Exercised \| shares	(20,833)
Number of Shares, Forfeited \| shares	(28,121)
Number of Shares, Awards outstanding, Ending balance \| shares	4,404,403
Number of Shares, Options exercisable \| shares	2,135,504
Number of Shares, Options exercisable, Weighted average remaining contractual term	6 years 1 month 6 days
Number of Shares, Options vested and expected to vest \| shares	4,157,649
Number of Shares, Options vested and expected to vest, Weighted average remaining contractual term	7 years 8 months 12 days
Weighted-Average Exercise Price, Awards outstanding, Beginning balance \| $ / shares	$ 4.41
Weighted-Average Exercise Price, Exercised \| $ / shares	2.24
Weighted-Average Exercise Price, Forfeited \| $ / shares	15.00
Weighted-Average Exercise Price, Awards outstanding, Ending balance \| $ / shares	4.35
Weighted-Average Exercise Price, Options exercisable \| $ / shares	6.74
Weighted-Average Exercise Price, Options vested and expected to vest \| $ / shares	$ 4.49

No definition available.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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- Definition

Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 that were terminated.

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- Definition

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 fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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