Revenues (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 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 | $ 21.6 | |
| Minimum | ||
| Revenue from External Customer [Line Items] | ||
| Subscription payment term | 30 days | |
| Maximum | ||
| Revenue from External Customer [Line Items] | ||
| Subscription payment term | 60 days |
| X | ||||||||||
- Definition Contract Duration No definition available.
|
| X | ||||||||||
- Definition Maximum Payment Term No definition available.
|
| X | ||||||||||
- Definition Subscription Payment Term No definition available.
|
| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|