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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | $ 40,999 | $ 38,115
Short-term deferred revenue and customer prepayments | (7,309) | (5,507)
Long-term deferred revenue | (733) | (1,054)
Deferred expenses | 1,650 | 1,897
Sales allowances | (597) | $ (741)
Accounting Standards Update 2014-09 [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | 2,884 |
Short-term deferred revenue and customer prepayments | (1,802) |
Long-term deferred revenue | 321 |
Deferred expenses | (247) |
Sales allowances | $ 144 |

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