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Business Segments, Geographic Data, and Sales by Major Customers - Additional Information (Detail) - Segment | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |
Number of reporting segments | 2 |
Net Accounts Receivable | Three Largest Customers | Customer Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Concentration risk percentage | 76.70% | 56.90%

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