Employee Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Contribution Plan Disclosure [Line Items]
Contribution for participating employees	$ 265,000	$ 213,000	$ 897,500	$ 756,000
Defined Contribution Plan, Plan Name			401(k)
Medical premium cost	941,000	$ 611,000	$ 3,000,000.0	$ 2,400,000
Additional liability for unpaid claims	$ 1,600,000		1,600,000
Stop loss coverage per employee			150,000
Defined contribution plan, aggregate limit for losses			$ 1,500,000
Defined contribution plan, aggregate stop loss commences threshold percentage			125.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary			4.00%
Defined contribution plan, aggregate limit for losses in provided amount			$ 1,000,000.0
First 3% of Employees [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary			100.00%
Next 2% of the Employees [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary			50.00%