Stock-Based Compensation - Summary of ESSP Activity (Detail) - Employee Stock Purchase Plan [Member] - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Options Outstanding, Beginning balance, Shares	0	0
Units awarded, Shares	157,706	180,859
Units vested/Shares awarded, Shares	(157,706)	(180,859)
Options Outstanding, Ending balance, Shares	0	0
Options Outstanding, Beginning balance, Weighted Average Exercise Price	$ 0.00	$ 0.00
Shares granted, Weighted Average Grant Date Fair Value	1.68	1.08
Units vested/Shares awarded, Weighted Average Fair Value	1.68	1.08
Options Outstanding, Ending balance, Weighted Average Exercise Price	$ 0.00	$ 0.00

Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]

No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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