Summary of Receivables and Deferred Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Balances from contracts with customers only:
Accounts receivable, net of reserves	$ 122,048	$ 71,389
Deferred revenue (included in accrued liabilities in the consolidated balance sheets)	16,337
Revenue recognized during the nine-month period ended September 30, 2021 relating to:
The beginning deferred revenue balance	$ 13,071

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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