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Revenue From Contracts with Customers - Current and Deferred Contracts (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Current deferred revenue  
Movement in Deferred Revenue [Roll Forward]  
Balance as of December 31, 2017 $ 20,784
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (21,905)
Increases due to cash received, excluding amounts recognized as revenue during the period 8,182
Foreign currency impact (88)
Balance as of September 30, 2018 6,973
Long-Term deferred revenue  
Movement in Deferred Revenue [Roll Forward]  
Balance as of December 31, 2017 0
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 8,241
Foreign currency impact (627)
Balance as of September 30, 2018 $ 7,614