Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Disaggregation of Revenue (Details)

v3.10.0.1
Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Net Sales $ 43,914,000 $ 39,021,000 $ 84,466,000 $ 77,112,000
Deferred revenue balances 0   $ 0  
Minimum        
Disaggregation of Revenue [Line Items]        
Payment terms on invoiced amount     30 days  
Maximum        
Disaggregation of Revenue [Line Items]        
Payment period     3 years  
Payment terms on invoiced amount     75 days  
Hardware and software product        
Disaggregation of Revenue [Line Items]        
Net Sales 40,111,000 34,931,000 $ 75,973,000 68,862,000
Software - security and highly interdependent with support        
Disaggregation of Revenue [Line Items]        
Net Sales 1,493,000 1,464,000 3,596,000 3,014,000
Maintenance, support and other services revenue        
Disaggregation of Revenue [Line Items]        
Net Sales $ 2,310,000 $ 2,626,000 $ 4,897,000 $ 5,236,000