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Summary of Receivables and Deferred Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Balances from contracts with customers only: |  |
Accounts receivable | $ 48,779 | $ 43,068
Deferred revenue (included in accrued liabilities in the consolidated balance sheets) | 7,276 |
Revenue recognized during the six month period ended June 30, 2020 relating to: |  |
The beginning deferred revenue balance | $ 2,747 |

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