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Additional Information with Respect to Non-vested Options (Detail) - Employee Stock Option $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average remaining contractual term	5 years 8 months 15 days
Weighted-average remaining expected term	8 months 15 days
Weighted-average remaining vesting period	8 months 15 days
Unrecognized compensation cost	$ 63

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Weighted Average Remaining Contractual Term 1

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- Definition

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- Definition

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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