Revenue (Details) |
6 Months Ended |
---|---|
Jun. 30, 2019
USD ($)
| |
Revenue, Performance Obligation [Abstract] | |
Number of Types of Performance Obligations | 2 |
Contract with Customer, Refund Liability | $ 0 |
Stand Ready Performance Obligations [Member] | |
Revenue, Performance Obligation [Abstract] | |
Revenue, Performance Obligation, Description of Good or Service | those that require us to stand ready to provide goods and services to a customer to use as and when requested (“Stand Ready Performance Obligations”) |
Other Performance Obligations [Member] | |
Revenue, Performance Obligation [Abstract] | |
Revenue, Performance Obligation, Description of Good or Service | those that do not require us to stand ready (“Other Performance Obligations”) |