Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Narrative)

v3.21.1
Organization and Summary of Significant Accounting Policies (Details Narrative)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Segment
Mar. 31, 2020
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Cumulative inventory write-downs $ 3,899   $ 4,000  
Warranty reserve $ 600   $ 600 $ 375
Number of operating segment | Segment 1      
Largest Vendors One [Member] | Accounts Payable [Member]        
Concentration risk 19.00%   10.00%  
Largest Vendors Two [Member] | Accounts Payable [Member]        
Concentration risk 15.00%   9.00%  
Largest Vendors Three [Member] | Accounts Payable [Member]        
Concentration risk 15.00%   8.00%  
Revenue [Member] | Sales to Telecommunications Customers [Member]        
Concentration risk 93.00% 95.00%    
Revenue [Member] | Sales to Telecommunications Customers [Member] | Largest Customer One [Member]        
Concentration risk 59.00% 69.00%    
Revenue [Member] | Sales to Telecommunications Customers [Member] | Largest Customer Two [Member]        
Concentration risk 15.00% 15.00%    
Revenue [Member] | Sales to Telecommunications Customers [Member] | Largest Customer Three [Member]        
Concentration risk 11.00%      
Accounts Receivable [Member] | Largest Customer One [Member]        
Concentration risk 71.00%   87.00%  
Accounts Receivable [Member] | Largest Customer Two [Member]        
Concentration risk 18.00%      
Australia [Member]        
Cash $ 14   $ 10  
Romania, New Leu [Member]        
Cash $ 27   $ 28  
International Customers [Member] | Revenue [Member] | Sales to Telecommunications Customers [Member]        
Concentration risk 26.00% 6.00%