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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | $ 51,080 | $ 40,999
Short-term deferred revenue and customer prepayments | (3,390) | (7,309)
Long-term deferred revenue | (493) | (733)
Deferred expenses | 848 | 1,650
Sales allowances | (1,661) | $ (597)
Accounting Standards Update 2014-09 [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | 10,081 |
Short-term deferred revenue and customer prepayments | 3,919 |
Long-term deferred revenue | 240 |
Deferred expenses | (802) |
Sales allowances | $ (1,064) |

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