Revenue Recognition (Details Textual)
|3 Months Ended|
Mar. 31, 2019
|Revenue Recognition (Textual)|
|Deferred revenue, description||We have deferred revenue of $60.0 million related to contractual commitments with customers where the performance obligation will be satisfied over time, which ranges from one to two years.|
Description of the transaction or nature of business giving rise to deferred revenue or unearned revenue, other than annual membership fees. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.
Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef