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v3.19.3.a.u2

Fair Value Measurements and Disclosures - Additional Information (Detail) - Contract | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |
Cash equivalents maturity period, days | 90 days |
Number of contracts outstanding | 0 | 0

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