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Summary of Significant Accounting Policies - Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Percent of remaining performance obligation expected to be recognized 66.20%
Recognition period for remaining performance obligation 12 months