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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | $ 38,115 | $ 43,673
Short-term deferred revenue and customer prepayments | (5,507) | (5,069)
Long-term deferred revenue | (1,054) | (232)
Deferred expenses | 1,897 | 501
Sales allowances | (741) | $ (548)
Accounting Standards Update 2014-09 [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | (5,558) |
Short-term deferred revenue and customer prepayments | (438) |
Long-term deferred revenue | (822) |
Deferred expenses | 1,396 |
Sales allowances | $ (193) |

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