Revenue (Tables) |
9 Months Ended | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2018 | ||||||||||||||||||||||
| Revenue from Contract with Customer [Abstract] | ||||||||||||||||||||||
| Deferred Revenue, by Arrangement, Disclosure |
Activity in the deferred revenue account was as follows:
|
| X | ||||||||||
- Definition Tabular disclosure of deferred revenue activity. No definition available.
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| X | ||||||||||
- References No definition available.
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