Quarterly report pursuant to Section 13 or 15(d)

Revenues (Details)

v3.10.0.1
Revenues (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
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 $ 29.4
Minimum  
Revenue from External Customer [Line Items]  
Subscription payment term 30 days
Maximum  
Revenue from External Customer [Line Items]  
Subscription payment term 60 days