Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) Business Customer	Mar. 31, 2020 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Number of business activities | Business	1
Cash held in foreign banks	$ 6.9		$ 17.6
Bad debt expense		$ 0.6
Bad debt recovery	$ 0.1
Customer Concentration Risk [Member] | Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.00%	10.00%
Number of customers accounted 10% or more concentration risk | Customer	0	0
Credit Concentration Risk [Member] | Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.00%		10.00%
Number of customers accounted 10% or more concentration risk | Customer	0		0