Annual report pursuant to Section 13 and 15(d)

Revenue Disaggregation of Revenue (Details)

v3.19.1
Revenue Disaggregation of Revenue (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
region
category
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disaggregation of Revenue [Line Items]      
Number of product categories | category 3    
Number of geographic regions | region 3    
Revenues $ 25,013 $ 28,167 $ 31,682
North America      
Disaggregation of Revenue [Line Items]      
Revenues 16,639 20,494 23,089
Europe      
Disaggregation of Revenue [Line Items]      
Revenues 6,453 6,914 7,924
Asia      
Disaggregation of Revenue [Line Items]      
Revenues 1,921 759 669
Software licenses and appliances      
Disaggregation of Revenue [Line Items]      
Revenues 5,814 5,982 5,839
Subscription, maintenance and support      
Disaggregation of Revenue [Line Items]      
Revenues 17,132 19,374 21,443
Professional services and other      
Disaggregation of Revenue [Line Items]      
Revenues 2,067 2,811 4,400
Total service      
Disaggregation of Revenue [Line Items]      
Revenues $ 19,199 $ 22,185 $ 25,843
Minimum | Computer Software      
Disaggregation of Revenue [Line Items]      
Useful life 1 year    
Maximum | Computer Software      
Disaggregation of Revenue [Line Items]      
Useful life 3 years