Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Aug. 31, 2019	Jan. 01, 2019
Nature Of Operations [Line Items]
Percentage of revenue transacted in foreign currency			3.00%	6.00%
Percentage of expenses transacted in foreign currency			18.00%	24.00%
Net foreign exchange gains (losses) resulting from foreign currency transactions included in other income	$ 200	$ 200	$ 100	$ 200
Right of Use Asset	2,317		2,317		$ 2,696	$ 2,100
Lease Liability	$ 4,205		$ 4,205
ASU 2016-02 [Member]
Nature Of Operations [Line Items]
Right of Use Asset							$ 1,500
Lease Liability							$ 1,600