Employee Benefit Plans - Additional Information (Detail) - 401 K Plan [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Minimum percentage of total annual compensation allowed to be deferred	1.00%
Employer matching contribution, description	Once eligible full-time employees have completed a minimum of one (1) year of service, and part time employees have worked at least 500 hours, the Company matches employee contributions to the 401(k) Plan in an amount per employee equal to one-third of the first 6% of the employee’s annual contributions, subject to legal limits.
Employee contributions to 401(k) Plan matched by company in an amount per employee of first 6% of employee's annual contributions	33.33%
Defined benefit plan amount expense	$ 203,000	$ 193,000	$ 182,000