Revenues - Schedule of Deferred Revenue Included in Contract Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Deferred Revenue Arrangement [Line Items]
Contract Liabilities, Balance			$ 4,335
Contract Liabilities, Balance	$ 6,701
ASU 2014-09 [Member]
Deferred Revenue Arrangement [Line Items]
Contract Liabilities, Balance	5,051	$ 4,548	4,335
Contract Liabilities, Deferral of revenue	3,095	1,822	2,177
Contract Liabilities, Recognition of previously unearned revenue	(1,445)	(1,319)	(1,964)
Contract Liabilities, Balance	$ 6,701	$ 5,051	$ 4,548