Quarterly report pursuant to Section 13 or 15(d)

Revenue (Disaggregation of Revenue) (Details)

v3.21.1
Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 5,820 $ 6,227
North America    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 3,938 4,050
Europe    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 1,621 1,874
Asia    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 261 303
Software licenses and appliances    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 108 1,540
Subscription, maintenance and support    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 4,979 4,160
Professional services and other    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers 733 527
Total service    
Disaggregation of Revenue [Line Items]    
Revenue from contracts with customers $ 5,712 $ 4,687