Deferred Revenues (Tables)
|9 Months Ended|
Sep. 30, 2017
|Deferred Revenue Disclosure [Abstract]|
|Schedule of Customer Deposits, Advances, Deferred Revenues, and Deferred Unit Costs||
Deferred revenues consisted of the following:
Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date.
Reference 1: http://www.xbrl.org/2003/role/presentationRef