Annual report pursuant to Section 13 and 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
1 Months Ended 12 Months Ended
Jan. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Net loss   $ (10,871) $ (4,045)  
Cash used in operating activities   (6,548) (2,167)  
Cash   1,646    
Working capital   10,123    
Proceeds from exercise of warrants   1,174  
Net sales   9,031 24,801  
Warranty reserve   600 375 $ 175
Inventory write-downs   3,400 270  
Cumulative inventory write-downs   4,000 600  
Research and development costs   $ 1,723 $ 2,276  
Number of operating segment | Segment   1    
Largest Vendors One [Member] | Accounts Payable [Member]        
Concentration risk   10.00%    
Largest Vendors Two [Member] | Accounts Payable [Member]        
Concentration risk   9.00% 10.00%  
Largest Vendors Three [Member] | Accounts Payable [Member]        
Concentration risk   8.00% 10.00%  
Largest Vendors One [Member] | Accounts Payable [Member]        
Concentration risk     11.00%  
International Sales [Member]        
Net sales   $ 1,522 $ 230  
Japan [Member] | Customer One [Member]        
Concentration risk   88.00%    
Australia [Member]        
Cash   $ 10 16  
Romania, New Leu [Member]        
Cash   $ 28 $ 4  
Revenue [Member] | Sales to Telecommunications Customers [Member]        
Concentration risk   96.00% 96.00%  
Revenue [Member] | Sales to Telecommunications Customers [Member] | Largest Customer One [Member]        
Concentration risk   52.00% 68.00%  
Revenue [Member] | Sales to Telecommunications Customers [Member] | Largest Customer Two [Member]        
Concentration risk   15.00% 17.00%  
Revenue [Member] | Sales to Telecommunications Customers [Member] | Largest Customer Three [Member]        
Concentration risk   14.00% 6.00%  
Revenue [Member] | Sales to Telecommunications Customers [Member] | Unites States [Member]        
Concentration risk   95.00% 63.00%  
Revenue [Member] | Sales to Telecommunications Customers [Member] | Internationsl Customers [Member]        
Concentration risk   17.00% 1.00%  
Accounts Receivable [Member] | Largest Customer One [Member]        
Concentration risk   87.00% 70.00%  
Accounts Receivable [Member] | Largest Customer Two [Member]        
Concentration risk     20.00%  
Common Stock [Member]        
Net loss    
Common Stock [Member] | Subsequent Event [Member]        
Sale of common stock | shares 750,000      
Net proceeds from issuance of common stock $ 12,500      
Warrant to purchase shares of common stock | shares 225,878      
Proceeds from exercise of warrants $ 707