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Summary of Receivables and Deferred Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Balances from contracts with customers only: |  |
Accounts receivable | $ 71,257 | $ 43,068
Deferred revenue (included in accrued liabilities in the consolidated balance sheets) | 15,318 | 5,005
Revenue recognized during years presented relating to: |  |
The beginning deferred revenue balance | $ 3,361 | $ 833

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