Revenue Recognition - Remaining Performance Obligations - Additional Information (Details 1) $ in Millions	Dec. 31, 2018 USD ($)
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation	$ 201.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation	$ 117.2
Remaining performance obligation recognition period	12 months
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation recognition period	2 years
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Disaggregation Of Revenue [Line Items]
Remaining performance obligation recognition period	3 years