|6 Months Ended|
Jun. 30, 2019
|Revenue from Contract with Customer [Abstract]|
|Schedule of contract assets and liabilities||
The following table summarizes the changes in the unbilled AR and deferred revenue balances for the six months ended June 30, 2019 (in thousands):
Tabular disclosure of contract balances and changes in contract balances.
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef