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Revenue from Contracts with Customers (Details 3) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Deferred Revenue, Noncurrent   $ 3,329 $ 2,483
Deferred Revenue, Current   4,896 5,304
Movement in Deferred Revenue [Roll Forward]      
Beginning balance $ 7,787    
Increase in deferred revenue representing our obligation to satisfy future performance obligations 7,475    
Decrease in deferred revenue for amounts recognized in Net Sales for satisfied performance obligations (6,951)    
Foreign currency fluctuations (86)    
Ending balance 8,225    
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining 2018   2,984  
2019   3,092  
2020   1,280  
2021   562  
2022   277  
Thereafter   30  
Total $ 7,787 $ 8,225 $ 7,787
Prepaid Maintenance Contract Duration, Minimum      
Disaggregation of Revenue [Line Items]      
Standard Prepaid Maintenance Contract Time Period 12 months    
Prepaid Maintenance Contract Duration, Maximum      
Disaggregation of Revenue [Line Items]      
Standard Prepaid Maintenance Contract Time Period 60 months