Contract Balances - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items]
Sales allowances and bad debt expense	$ 124,000	$ 1,912,000	$ 2,269,000
Revenue, Remaining performance obligation	191,500,000
Prepaid Expenses and Other Current Assets
Contract With Customer Asset And Liability [Line Items]
Assets impairment charges	0	0	0
Contract assets	1,200,000	800,000
Current Deferred Revenue and Advanced Payments
Contract With Customer Asset And Liability [Line Items]
Revenue recognized from beginning deferred revenue	$ 174,700,000	$ 194,600,000	$ 196,700,000