Quarterly report pursuant to Section 13 or 15(d)

Revenue - Performance Obligations (Details)

v3.8.0.1
Revenue - Performance Obligations (Details)
 3 Months Ended
Mar. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 97.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, percentage 3.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period