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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | $ 55,012 | $ 40,999
Short-term deferred revenue and customer prepayments | (3,916) | (7,309)
Long-term deferred revenue | (573) | (733)
Deferred expenses | 980 | 1,650
Sales allowances | (1,919) | $ (597)
Accounting Standards Update 2014-09 [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | 14,013 |
Short-term deferred revenue and customer prepayments | 3,393 |
Long-term deferred revenue | 160 |
Deferred expenses | (670) |
Sales allowances | $ (1,322) |

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