Revenue Related Disclosures - Estimated Remaining Performance Obligations - Additional Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 9.5
Estimated remaining performance obligations for contractually committed revenues recognition period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 29.6
Estimated remaining performance obligations for contractually committed revenues recognition period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 18.2
Estimated remaining performance obligations for contractually committed revenues recognition period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Estimated remaining performance obligations for contractually committed revenues	$ 3.1
Estimated remaining performance obligations for contractually committed revenues recognition period	3 years