Long-Term Debt - Paycheck Protection Program - Additional Information (Detail) - USD ($)		9 Months Ended		12 Months Ended
	Apr. 24, 2020	Sep. 30, 2020	[1]	Dec. 31, 2019	[1]
Debt Disclosure [Abstract]
Loan amount received under paycheck protection plan	$ 5,500,000	$ 5,516,000		$ 0
Paycheck protection program loan of 2020, term	2 years
Paycheck protection program Loan of 2020, interest rate	1.00%
Paycheck protection program loan, principal or interest due next six months	$ 0

[1] See below for additional information regarding the receipt of the paycheck protection program loan.