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Revenue From Contracts with Customers - Current and Deferred Contracts (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Current deferred revenue  
Movement in Deferred Revenue [Roll Forward]  
Balance as of December 31, 2018 $ 5,380
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (1,643)
Increases due to cash received, excluding amounts recognized as revenue during the period 910
Foreign currency impact 4
Balance as of March 31, 2019 4,651
Long-Term deferred revenue  
Movement in Deferred Revenue [Roll Forward]  
Balance as of December 31, 2018 7,716
Revenue recognized that was included in the deferred revenue balance at the beginning of the period 0
Increases due to cash received, excluding amounts recognized as revenue during the period 0
Foreign currency impact 36
Balance as of March 31, 2019 $ 7,752