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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | $ 39,987 | $ 43,673
Short-term deferred revenue | (4,239) | (3,820)
Long-term deferred revenue | (1,134) | (232)
Deferred expenses | 1,418 | 501
Customer prepayments | (1,604) | (1,250)
Sales allowances | (1,076) | $ (548)
Accounting Standards Update 2014-09 [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable | (3,686) |
Short-term deferred revenue | (419) |
Long-term deferred revenue | (902) |
Deferred expenses | 917 |
Customer prepayments | (354) |
Sales allowances | $ (528) |

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