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Revenues by Geography, Concentration of Credit Risk and Remaining Performance Obligations - Additional Information 1 (Detail) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]  
Percentage of remaining performance obligations on which revenue is expected to be recognized 35.00%
Unearned income recognition period 12 months