Quarterly report pursuant to Section 13 or 15(d)

Revenue Related Disclosures - Estimated Remaining Performance Obligations - Additional Information (Details)

v3.19.2
Revenue Related Disclosures - Estimated Remaining Performance Obligations - Additional Information (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-07-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Estimated remaining performance obligations for contractually committed revenues $ 17.7
Estimated remaining performance obligations for contractually committed revenues recognition period 6 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 $ 25.2
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 $ 15.5
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 $ 0.9
Estimated remaining performance obligations for contractually committed revenues recognition period 3 years