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Employee Benefit Plan (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined contribution plan employer matching percent	50.00%
Defined contribution plan maximum employee contribution percent	6.00%
Defined contribution plan vesting period	4 years
Defined contribution plan matching amount	$ 0.9	$ 0.8	$ 0.9

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- References

No definition available.

+ Details

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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- Definition

Period which an employee's right to employer matching contribution to defined contribution plan is no longer contingent on satisfaction of a service condition.

+ References

No definition available.

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