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v3.19.3.a.u2

Revenues - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 Customer | Dec. 31, 2018 Customer | Dec. 31, 2017 Customer
Decrease in net revenues | $ | $ 10,595,000 |  |  |
Number of customers | Customer |  | 1 | 1 | 1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |
Percentage of total net revenues |  | 12.70% | 13.40% | 13.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | China [Member] |  |  |  |
Percentage of total net revenues |  | 22.10% | 37.40% | 35.80%

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