Quarterly report pursuant to Section 13 or 15(d)

Revenues (Details)

v3.10.0.1
Revenues (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract duration 1 year  
Maximum payment term 1 year  
Revenue from External Customer [Line Items]    
Revenues recognized, previously included deferred revenue   $ 27.0
Minimum    
Revenue from External Customer [Line Items]    
Subscription payment term 30 days  
Maximum    
Revenue from External Customer [Line Items]    
Subscription payment term 60 days