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Business Segments, Geographic Data, and Sales by Major Customers - Additional Information (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) Segment | Jun. 30, 2018 USD ($) | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Number of reporting segments | Segment | 3 |  |
Provision for doubtful accounts | $ | $ (248) | $ 12,468 |
Net Accounts Receivable | Three Largest Customers | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 68.10% |  | 61.40%

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