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Summary of Significant Accounting Policies - Performance Obligation (Detail) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Sep. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Percent of remaining performance obligation expected to be recognized 78.10%
Recognition period for remaining performance obligation 12 months